I loved everything about your game! The music, the visuals, the difficulty curve...plus it's always nice to see another Godot user haha. I think it's one of my favorites out of what I've played so far!!
I do wonder if allowing the player to accelerate the ship with the "Space" key would make it feel like you have a bit more control and agency; however, I assume that the level design is based heavily on the curves and loops that are possible with a fixed speed, so that might be much harder to implement than it seems. Amazing work!!