Nice, I'm ready for a long journey again watching your game shaping up! :D
I forgot to ask: how did you made that "bullet" that's zig-zagging up and down? Did you used an AnimationPlayer for that?
Haha well i don't know how long this journey will be but still i got quite a lot to work on, so you'll have to wait and see i guess XD
And about the zig zagging projectile, i didn't use the animation player, although it could probably be acheived using it, but here i just have a timer that alters the "bullet" path on the fly, probably not the best way but it's something i tried out at random to see if it worked as i expected it to, and luckily it did :D