That song is an absolute banger lol. It makes the whole thing feel energetic right away. Switching between the different states is where it really shines. Once it clicks, swapping forms to solve puzzles feels great. I especially liked the zoom-out feature to see the whole level, super helpful and doesn't break the flow.
Each form having its own personality (and its own death) is such a good detail. The basic platformer one with the little Mario-style hat made me laugh. And the dialogue throughout is pretty funny.
There's a good amount of variety in the level design too. This was really fun, really glad I played this.