I love the way you guys combined a variety of media types to make your assets. Very few games use claymation, and seeing your character so well animated reminded me instantly of "The Neverhood". I would suggest adding more player moves as you already have a good chunk of animations your character can do. I also encountered a bug where getting hit by enemies was not lowering my player's health, which I think could be an easy fix.
I know you mentioned this is more of a proof of concept, but I would love to see more of the narrative behind the game to make more sense of the ending. You have a really great foundation here that you should definitely look towards expanding upon!