This is a really cool idea, but I think the controls get a little frustrating. I like that you can get multiple controllable characters to help you reach the end and it certainly gets chaotic. However, the controls feel a little sporadic. Sometimes it doesn't feel like I'm able to move at all, and the butterflies don't go in the direct they're supposed to even though they're facing the right way. I got stuck on the third level with all the spikes. I couldn't get a grip on the controls to get any through alive.
Good job on completing this though. The idea is really cool, just needed a bit more tuning on the controls :)