Love it. Really impressive game. I’d suggest having the Power-Up description displayed at the viewports edge, so that it’ll be always visible. However, once you’ve played a couple of round, you’ll know them anyway. Reading the descriptions of Items is a little bit stressing, but maybe this is intended. Love the name of the final boss.
All in all, very well crafted game. I am a Godot developer too; if sharing the source code is an option to you, I’d love to take a look how other developers utilize the engine.