The sounds and music could use a little improvement, since they can get repetitive, but a cool concept, nonetheless.

An interesting little game - good idea, I think it needs a little bit of juice. The level up system works well, it's nice to have a goal to work towards!

I can think of a few things you might want to improve:

• player speed wants to start 4x or 5x what the starting value is, and I'd reduce the amount of inertia when you move!
• I could stand still and the game would basically play itself. One fix for this would be making it so the player has a very small amount of health - 3 hits and you're dead, that sort of thing.
• I think the visual style could use some love. Giving the player character a face, for example, goes against the spirit of the jam in my opinion! You can also use existing colour palettes from somewhere like https://lospec.com/palette-list to make it look really nice with very little effort :)
• I got hit by what I assume was a very very transparent shape, and that felt a little bit unfair - I couldn't see it. Maybe make it fade to ~50% transparency over time, then quickly fade to 0 once the time is up? 

I liked the patterns and the way the shapes bounce around, though :)