I like the concept! It's enjoyable to destroy the blocks and zoom across the level, and the graphics are pretty nice, especially the wave effect. Though, there are some parts that could use some more work:
Enemies do not turn around, so it's easy to get into their blind spots, or even just walk past them with no problem. Also, I don't know if it's just me but sometimes the wave button just won't work until I reset the game and I got stuck in a few levels because of that. Pressing C to throw rocks also did not work for me.
That being said, for your first game in Godot, this is still really nice! Good work!