Very fun to play and it looks amazing as well!
Some things that I noticed while playing:
- Clicking all the time can feel strenuous
- I accidentally chose an upgrade because I was actively shooting enemies
As already said in another comment, I felt like the progression stopped in difficulty and in upgrading.
A possible solution for this could be to make the upgrading system more modular. Meaning you upgrade parts of your character every time, instead of getting an entirely new character.
All in all it's a terrific game jam submission ^-^