Loved the idea, it felt unique and fun. I liked the reset powerup mechanic, also the fact that slimes and blue guys can be used as platforms or farmed for exp was nice.
Levels were great but few of them were very hard. At the beginning with two boulders and slime level was quite hard, not sure how to complete it, started running around until the boulders moved a little.
And got completely stuck on Forest - 6 (not sure how many levels there are after that), It was an interesting one with four blue guys, but the level did not seem to have full walls, so I always threw them out of the world and didn't manage to throw all of them there to trigger the button.
Overall cool concept and a great atmosphere with nice art. I enjoyed it a lot and was quite invested in getting as far as I could :D
Some improvements on the player controller and you got yourself a really nice cute game. Impressive work made in such a short time!