Cool game and great job using Playroom! (haven't seen many)
The visuals and the audio fit really well together; it's like a retro arcade game! Love the artwork for the bosses especially the shark. I tested the multiplayer and it plays without a problem.
The movement needs a bit of tweaking though. I often find myself spinning around the boss faster than lightspeed. The fire rate is tied to how fast you can click so you can defeat a boss really quickly.