Love the Geometry Wars vibes, with the little scaling twist this is a great game!
For me , there's a predictable lag when you kill the first enemy in the game (which is a known Godot thing related to particles, I think), but it doesn't detract at all from the experience
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Possibly related to this but for 2D, but I'm no expert :)
https://github.com/godotengine/godot/issues/87891