Hmm... Why did And Yet It Moves sell better on Wii than Chasing Aurora did on Wii U?
One has a meaningful single-player mode, one doesn't. One had a large install base, one didn't. One felt like a an art project that was accessible enough for others to appreciate, the other felt like a passion project that didn't easily give away it's true value easily.
Without being too subtle, it's no surprise that one sold much better than the other.
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WiiWare suggestions for the next retroactive:
* Fluidity - There is a 3DS game with the same branding, but it's a very different (and in my opinion, much less enjoyable) experience. Do this one! It deserves more attention than it got!
* Bonsai Barber - Not really something I recommend, but it's weird and unique and won't live on beyond WiiWare. Not as weird as Let's Catch, but can you really talk about Let's Catch without also discussing Let's Tap - or at least listening to the theme song?