My first impressions on this game were shockingly good. Everything was definitely a 5/5 up until I actually got into a level.
Unfortunately, the platformer character lacks many fundamental features in their movement, specifically coyote time. This resulted in rather frustrating platforming gameplay, that often felt like the cause of death's were the game's fault, and not mine.
The use of free assets mixed in with beautifully drawn hand-made one's was definitely a mistake, and ends up making the game feel very unpolished and thrown together.
On the third level, I also encountered a bug where none of the enemies noticed me and wasn't able to kill them. (No matter how close I got to them.)
I really do like your game, and I implore you to keep working on it after the jam. Great job on this one!