This game is great! Even better than the first! A few comments though-the polter animation is a bit too long, and if you're a noob like me, it's impossible to get past the first Luigi segment! Also, the running mechanic is too slow, and you stop running if you switch dimensions. Otherwise this game would sell millions if nintendo made it.

Wall collision when characters are running at high speeds is something that I've had some difficulty with. The clipping issues don't always happen consistently which makes it harder to test for. It's got to do with characters going fast enough that they bypass the check for the wall collision, and instead the floor collision occurs instead, which results in the player getting shot up to the top of the solid surface. Once I get a complete fix working I'll let everyone know.

1: Mario clips into the walls in the vertical part of the orange forest stage.