glad to hear you are working on a post jam version, if you want some feedback i'd say focus on the id stealing and the ridiculousness of turning into stuff, for example: have a rock enemy that can only be fought when your id is hammer or something and you need to be a rock to get past a stage. Also like i said before stay in the small areas i get that i had to fit the theme but i feel it took away what made it good.
Anyways good luck!