Nice work! The game looked very nice and I would have enjoyed a few more levels. I agree with another commenter that the movement felt a little slow and it would be worth trying out different speeds to find a sweet spot. Maybe this was intentional but I noticed that when the enemies die, their projectiles are destroyed as well which decreased the difficulty a bit for me. Great job!

Congrats on your submission!  I have two critiques.  One is that the bullets weren't capped on my side, so I was able to spam spacebar like crazy to get a ton of bullets on the screen.  I'd recommend using a boolean variable "can_shoot" or something with a  timer node to limit the player's shooting ability.  Connect to the timer's timeout function and set can_shoot to true.  In the shoot function, if can_shoot is false, return otherwise set can_shoot to false and start the shot_timer.  The other is, the Ship's movement felt a little slow, so even though there wasn't a lot of enemies, I felt like I might die a few times because I didn't think I was going to be able to move out of the way in time.