Fun to play, great art, catchy music - successful all in all. As some others said, the gun felt too weak, and killing enemies didn’t seem worth the effort vs just running around and waiting it out. I also stopped buying upgrades pretty quickly and saved for the 7s. That said, this was really well done, so nice work!
Edit: I should also mention that I didn’t realize there was a strafing mechanic until round 4. It’s worth highlighting to players, because it makes the gun more useful. This game is also begging for controller support! :)