I really enjoyed this prototype of the game. There's a few things I'd like to see in this game, but I understand if my ideas come off as too ambitious. First off, I think it'd be cool if there was some grid based movement in the game like something along the lines of Etrian Odyssey. I just think a simple movement system could go a long way. It'd take advantage of the more jiggly transformations, plus I think having a small hub area like a tavern or something would also be cool.
Another thing, I think some more outfit options would be nice, but I understand that adding something like that would take a lot more work, but I figured I'd throw that out there anyways.
Lastly, more about the tavern idea, perhaps there could be NPCs in the tavern that'll talk to you differently depending on how you currently look, plus having an option on whether to remove the transformation or keep it would also be nice. I think the transformations can have their weaknesses as shown in the demo, but expanding on the strengths would be good as well, like how OPP explains how adventurers discovered that they can use their giant butts to easily destroy skeletons.