Very fun I got to wave 16 and unlocked all the upgrades. I got hit once right at the end so had 90hp left
I like the idea of the player switching back and forth, I can imagine if you add many characters with different roles/skills it can increase the challenge and spice up the game!
Only thing I would say is probably make the bullet speed or player speed faster, or add an upgrade to increase bullet or movement speed. But with the limited time of the jam it's probably asking for too much.
Either way I enjoyed playing the game good job!