Overall its an amazing game. I really liked the idea, and i think its so original. Congrats :D

This is really neat, the art style is great and I like how varied the levels are and they all look fun and have fitting music - As I played I kept looking forwards to seeing what the next level was like, well done :) The rewind mechanic to go backwards is cool too and the movement feels pretty solid

The one small thing that caught me was that I accidentally pressed the skip level key when I was meaning to restart the level. Maybe the skip key should not be so close to other keys you'd normally press during gameplay?

Either way a nice fun game :)

I love the audio manipulation here. Maybe if you had more time had different levels where you boosted the base or used different wave sources.