Ah man, I wanted to like the game because the art visuals and lighting looked so good, and it is probably the best I've seen in the jam so far. But the actual gameplay was kind of meh.
Some people in the comments liked the sound effects, but I personally didn't. To me, it sounded too random. I also spammed clicking the mouse button without any thought for strategy, and I didn't like the fact that your jumps were too short.
Instead of firing random projectiles, I would instead select a random weapon for a specific period of time. I don't care for the healing projectile one, I would just scatter health as the level progresses.
I would say keep the art, add a couple flying enemies and just work on the overall concept just a little bit more.