The overall structure of going back and forth is cool. I particularly like how it plays with the title (the return of) 😁
I'm not sure about the way bombs work, they are a bit awkward to shoot for me. I think if they simply exploded on contact they would feel better.
The game also seems quite jittery on my machine, after the camera starts following the character. Perhaps the camera and character use different processing? That's the usual cause of this issue (at least in Unity, where there's update and fixed update), I found this doc for Godot, maybe it can help https://docs.godotengine.org/en/4.4/tutorials/scripting/idle_and_physics_process...
Most importantly, congrats on your first game!
Editing to add my score ^^