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Thank you for playing.
The level is mostly procedurally generated (enemy placement, enemy types, amount, health, money dropped). The level borders I made by hand, just a bunch of white Line2D nodes :D.  Then I stored the nodes in an array to iterate through.
In code, I used the coordinates from line2d.points to create a cutout PolygonShape2D (with polygon subtraction) for the collision.  So in the end, creating a new level was basically just drawing a Line2D polygon and adding it to the array.

Level 45 is completely done by hand because I wanted a performance check at the end, with lots of spawns and a 99 HP shape. It's definitely worth trying out if you skipped everything else, just make sure to get some damage upgrades. It's the best level in my opinion but also the laggiest :D

Your idea with the projectile path is actually genius. That didn't even come to mind when I was deep in chaos during the dev phase.

One aspect of the style is very easy to achieve and thats the glow effect. its just one node that you add in godot called WorldEnvironment. it has a bunch of cool effects.