Due to the platform's size limitations, Team Meat was forced to cut content from the game.
In the official development blog for Super Meat Boy, developer Edmund McMillen confirmed that the WiiWare version of the game will have content cut due to the service's limitations.
McMillen explained to a reader that "We are running into file size issues on the Wii (meaning we will have to cut some music and other things to make it fit). We are also not doing any online stuff on the Wii because we dont want to push the game back till next year, but these additions won't really effect the main game much at all."
Super Meat Boy is scheduled to come to WiiWare this Summer.