This is great entry!! Firstly, the art style really pops and the semi-3D approach works really well for this type of gameplay! I've never figured out how to pull off that 80s synthwave aesthetic but you've done a great job here, and you complimented it super well with the music and sfx, also. Your intro sequence was super polished, also, and I wish I could have seen more of it but unfortunately I couldn't complete all the rounds :P I see that you've added a boss fight after the wave system (which worked great, btw!), so I'd love to see some footage of that sometime. You've really put a lot of energy and love into this project and it shows!!
Some improvements I'd recommend is that the font is a bit difficult to read - with the time pressure of the jam that's obviously fair, but something to consider for future updates if you want to follow that ^^ I'd also give a bit of stun/freeze to the enemies once they hit you to give a chance for the player to escape, and that might also help with the non-regenerating health mechanic. Although that adds to the difficulty, I would've liked some (possibly optional) opportunities for health regen, or possibly other upgrades to max health, move speed, etc. But really, those are just small things - well done!! :D