Hey there!
Considering the amount of time you had, this feels very well polished! The game plays smoothly, the graphics are wonderful, and I love how tongue-in-cheek it is about itself and the jam as a whole.
My only feedback would be to grant some space between the boss and the player - numerous times I died simply because the boss was sitting on top of the spawn point lol.
Overall, great game! I had a blast playing!