I'm not entirely sure why, but this was somewhat nauseating for me. I think maybe it has to do with the fast moving clouds in the BG. I've played Super Monkey Ball and it definitely doesn't have that effect on me, so yeah, not sure. I wish there was a bit more colors in the world just to ease on the red, as it felt a little eye-straining.
Viewing post in A Cat's Bad Dream jam comments
I figured that was the case (for the colors, I mean), but I can suggest maybe dark deep blues for the BG can help cause the red on the floors isn't that bad, just the yarn (unavoidable to look at) and the sky. But that's for later, if you wanted to work more on the game after the jam. Gameplay itself I can see as being fun. Once the nausea-feeling is removed, cause the ball itself handled well. I think it might be the slight disconnect between the camera and the world movement... I honestly don't know what else to say, but just studying Super Monkey Ball and how it plays I guess might help. xD