Really original and fun idea! Definitely one of my favourites of this jam (I especially liked it when I realized that I could move XD).
For the most part I think the "gloop" hud element is pretty pointless since your gloop is also represented by your size. Though sometimes it is useful in more precise levels.
I like pixel art, and I really appreciate it when the game's resolution matches the pixel art (so you get "pixel perfect" movement and rotation), but in this case the low resolution isn't that great because it kind of breaks up the player's face when it rotates. Since the game is just simple shapes it would make sense for it to be high resolution (and would be pretty easy to do as well).
Other than those 2 things, I had a really good time on this game. Thank you for making it!