I really love this game, it has enough new mechanics to feel refreshing even in a genre so overdone as platformers. The art and music engross you into the world, which makes the simple yet surprising narrative powerful. And since you move quickly you can blaze through the easy parts, making the difficulty curve feel perfect.
Pressing P or T to switch shape was quite difficult during the action though, and I don't understand why a sprint button was necessary (I would just make it the normal speed).
I'll be looking forward to your next game :)