Simple concept and very well executed. I had a lot of fun playing! I like how the sounds and background music go together as you kill things. The gameplay is easy to learn and keeps you on you toes as you play.
Also, very good lighting effects and presentation! It would have been easy to just stick the score in the corner and call it a day, but it looks so much better behind the action! And the little screen shake as you kill enemies feels *Chef's Kiss*
Also the particle effects that the enemies emit when they spawn/die look very nice. I don't know how particles work in unity, but I've played around with them a bit in Godot and I know they are hard to get right.
Overall, very nice work!