Cool game, very impressive for a prototype. It plays smoothly and the art already has a lot of personality despite the game being in an early stage of development.
My only real criticism is to do with having different camera perspectives for various assets in the game. Some of them are top down like the blocks, some are almost side on like the player character and some are half way in between which overall can be somewhat visually confusing.
I'm not entirely sure what the exact solution is and you're clearly a much better artist than I'll ever be anyway, so I'll just suggest looking at games like The Legend of Zelda: Minish Cap approach it and leave it at that.
Good luck with further development!