Love the idea and the execution!

A couple of thoughts from someone who is also developing a nodebusterlike with Godot:

1. the game is lagging quite noticeably even in early game, and I imagine it's going to get worse when the number of enemies and drops goes up. Replace nodes with shaders or take a second look at your physics, surely there's something to be optimized there.

2. I feel like you're copying too much from nodebuster. Nothing wrong there, it's a great game and I'm making a derivative myself, but since you're also taking from arkanoid, why not replace some nodebuster aspects with arkanoid's, so it becomes more unique? Like, instead of a big boss, make it so that the player must destroy a wall of bricks to go the next prestige level, or instead of making the player loss health from the number of enemies make it lose health every time they touch the ground (as when the ball touches the ground in arkanoid and you lose a life).

3. the pace is quite slow. Maybe I'm being impatient right now, or maybe it's the FPS drop, but it borders on boring.