You are gonna play it, right? You're missing out on one of the greatest games in years if you don't.
If you're afraid of how difficult and obtuse the game, then
what happened to you, player who just recently praised Souls games for the very same and spent hours writing walls of text on how you hate Nintendo tutorials you're in luck, cause i wrote this guide. Hopefully it will help you to enjoy the game even more,
when you will start playing it.
Basics:
The game is 3d action brawler. Think Devil May Cry or Bayonetta only in an isometric perspective. Unusual camera placement requires you to watch area all around you instead of focusing on one-two enemies you see in third person view.
Enemies usually come in groups of two-three big mooks. Sometimes each big mook may come with his own entourage of little dudes who will run over the area. Mostly you have to concentrate on big guys, but even little dudes can harm you. You have to look for visual cues and sounds to know when they're going to attack and when it's safe for you to start the combo.
You don't control an entire crowd of heroes. You control a leader and everyone else are just material for your morphs. They can burn, get squished or fall to their doom -- it doesn't matter as long as leader is okay. You will lose health, only if he gets hurt. Of course you will be restricted with your morphs if you lose too many characters -- you simply won't have enough ink to draw figures you want. After a while incapacitated heroes will reappear near you.
Having more characters is preferable because bigger drawing results in bigger weapons.
Weapon switching:
Your weapon (morph) depends on who is currently the leader in your crowd. As you play with your character he/she will level-up, giving you more combos to do with this weapon. That's why later in a game you need to switch your leaders manually to level up all the characters to the max. You can do it on touchscreen by pressing bottom part of the touchscreen. UI for character level-up management is rather clunky. Press Y two times to sort characters by the weapon they wield. Switch between them with D-Pad, this also shows you their current level.
After you selected your weapon by drawing it and pressing A, you don't need to draw it again next time. Just press A again. The weapon you currently have is shown on the screen in the left upper corner:

As you can see on the screenshot, i have Fist selected but i also drew a line to conjure a Sword. Now i can either:
- commit to Sword by pressing A
- cancel Sword with Y, and press A to make Fist again
- press X to make characters involved in the blue line to form their own sword and attack separately from the main crowd. After they will finish their combo they will come back.
This way i basically have two weapons at my disposal, readily available for me in less than a second when i will decide to attack.
This helps when you're preparing for next enemy encounter. You can draw a big weapon beforehand, press A selecting it, then disband it with Y (but it will still stay selected), and later when you will need to attack you can just press A two times -- first time to take out selected weapon, second time to start attack right away. Stored weapon will even remain its' size.
You need to "cache" weapons like that, because big weapons don't stay big for long and are generally unwieldy to walk around with. Your speed is very low when you have a weapon equipped.
Drawing weapons:
When you start to draw game goes into slo-mo giving you a plenty of time to draw the right figure.
So don't panic, when you start drawing, you have at the very least a few seconds and can mess up a bit.
If you're drawing on a touchscreen, i recommend using left hand thumb (or index), because that way you don't have to move your right hand away from face buttons and can press X or A to select the weapon instantly.
But the preferred way is to use right stick. It will become apparent when you will get used to control scheme. Right stick allows for faster weapon switching and you can make them bigger too -- touchscreen simply doesn't have enough space for big drawings.
Note that you need to have enough free space to draw on. Avoid areas like lava, fire or spikes or spikey enemies, because your line will collapse if it's end will touch with hazardous environment and you will have to start all over. Also keep in mind that civilians can get in your way because you recruit them by circling around them. Just move with left stick away from them or start over on other side.
Sword is the easiest to draw -- it's a simple line. Just move your right stick in one direction and press A and viola. Because of that it's a great weapon to for multi unite morphs -- just make a quick movement with a stick and press X and for the next three or so seconds you have a separate sword hitting everything around. Sword is great to clear the area of little guys, just draw a big sword and swing away.
Each weapon has additional functions. Sword can reflect laser beams and absorb electricity. It also counters other swords, when Wonder Blue quickly shows up and says "hey!" in the corner of the screen, that means you need to equip sword fast and then wait a bit without attacking.
Sword is cool and all, but when you need a to inflict a real focused damage, you need a
Fist.
Fist is equipped by drawing a circle (or almost circle). It's a bit trickier than sword but should still be easy enough. Make sure not to circle civilians running around because instead of becoming red, line will turn rainbow and you will recruit them and instead of conjuring a fist. If you want to make a big fist with a right stick, just draw a half circle and then keep the line going and going to add more people.
Fist absorbs fire attacks.
Gun is two lines at an angle. Should be pretty easy. If you have problems aiming the gun use focusing (watch the second video by Saur i link at the end of the post). Gun can suck enemies and bombs up and shoot them back. Note that then you're not shooting an enemy back, you're using your own guys as a bullets. Guys that you shot at the enemy will cling to it and will impede his movement of even shock him.
Gun is the best way to deal with pesky little UFO. If you make a big gun, it will turn into Super Scope shaped bazooka and will fire rockets.
Whip is a wavy line. Same line as sword only shake it a bit. Used against spiky walls and enemies. If enemy is in shocked state you can grab them with the whip and throw them around. Watch out for pink outlines on environment and enemies -- that means you use whip on them.
Hammer is a tricky one and probably the one everyone have the most problems with. You need to draw a sickle to form a hammer (hurr durr, Kamiya). It's basically a mirrored question mark. Or you can draw a question mark -- it will work the same.

Many people (including me) found that game was often picking whip instead of hammer. Here is how you do it reliably:
- Draw a line. It's probably better to keep the line short, because you will need more ink for second part.
- Release the right stick. Let it go into neutral position.
- Now draw a circle or half circle until it will go from blue to pink to yellow.
Works every time.
Hammer also works as armoured roof against air bombs. Also you can use it as an anchor to dive in water.
Claws is easy to draw. It's basically a Zorro sign. Three fast strokes making letter Z (or N). Claws can rip open metallic things and can freeze enemies. They're the weakest weapon in the game but they're incredibly fast. It's great to boost combo meter with them.
You can climb walls with them. Can counter chainsaws with a similar cue as sword (Wonder White briefly appearing in the corner).
BombIt's a circle then a short line coming from it. I am drawing it like
6 when starting from center:

Bomb works great for secondary attack with X. You throw it, slowing enemies down and can hack them away with whatever you have.
GliderGlider's triangle is kinda hard for me to do reliably with a stick, so i am usually doing it on a touchscreen. Especially when it's QTE where i can't waste time fiddling around.
Wonderful Mart:
First thing you need to do after finishing prologue, go into Wonderful Mart and buy Guts and Spring.
I repeat:
After finishing prologue, go into Wonderful Mart and buy Guts and Spring.
These two are the most basic abilities and are the most crucial morphs by far. I have no idea why they're not on by default, they were in the demo.
Learn how to use guts (pudding). The timing is kinda off at first but after practice you will find great enjoyment at blocking attacks with it. Just note that it can only work against blunt attacks, sharp objects or beam attacks as expected will pierce right through. Also don't try to block attacks from enraged enemies -- guts won't do against them, just dodge.
"Items" in wonderful mart are mostly consumables that you can use to replenish health or unite gauge. Note that using items will ruin your score so if you care about that, avoid using them.
There are a few special items that are allowed to use:
- Justice Missile -- when you hit 100 characters in your crowd, surplus from your recruiting on the level goes for these missiles. Every ten citizens makes for one missile. Select it by pressing left right on d-pad and activate it by pressing down for a second. You aim the rocket with tilt controls on gamepad, touch the screen to launch it.
- Treasure Sensor -- you only need to buy it once. After you got it, P-Star (flying thingy that follows you) will start beeping when you will have a treasure nearby. Treasures are hidden stuff hidden on the ground or on the walls. You can reveal them either by circling around them with a drawing line or by hitting the ground with a hammer.
- Wonderful Dummy -- this is basically a continue. When you die, dummy sacrifices itself and takes your place while you stay alive and your vitality is replenished. After you used a dummy, you can buy another one, but only one.
Skills:
There are three additional skills for each weapon.
- Launcher -- press B, then A. If your enemy is in shocked state you will launch him in the air, and once he is in the air, he a punching bag for your combos. See Saur's videos below for evidence.
- Cyclone -- do 360 with your left stick then press A. You will start rotating with your weapon doing a wide area attack. Mash A to prolong attack a bit more.
- Stinger -- it's a focused attack aimed at specific enemy or a group of enemies. Tilt the stick away from the target then towards it, then press A.
Launchers and stingers can also be used for movement. You can reach higher areas adding a few launchers at the end of a Rocket. Or jump for longer distances using fist or sword stingers.
Cheap technique i discovered today.

Use Gun Stinger (multiple shots that stagger enemy) from afar, then use multi unite morphs on him. Lots of damage and combo points while you're staying at safe distance. Works on nearly everything. Maybe sprinkle a bomb on it or two.
Too long, didn't read:
Just watch these videos:
http://www.youtube.com/watch?v=sdHbPXNJvVEhttp://www.youtube.com/watch?v=RSAbLRnGiWgEven if you did read my guide, you still need to watch these videos, they're explaining some other finer elements of the game better than i can.
Also, feel free to ask questions about the game.