Beautiful artwork, but difficult controls. For now, there's no use for coins, so I can't say much about them.

It has potential. It's frustrating to control at first, but you get used to it.

A very fascinating little.. toy, I suppose? It's very engaging though, and I could see its mechanics being solid enough to be made into a full game. Some overarching story about an odd form of great plague to tie everything together, and the fate of the world depending on how many people you accidentally turn into toads. Joking aside, cool stuff, and great job!