Nice game! I wish you could just smash enemies once you grow big enough. :)
Gameplay would need some polish and something original to stand out from a generic platformer. I liked the trick with growing and I think it could be utilized more.
Art is very nice! The rat animation is adorable and the background is awesome.
Music is great! Really fits the mood. I just wish there would some sound effects too.
Great job, keep it up!