Hey congrats on your first jam! Everything seems to be working well, just needs more stuff to build it out. I suggest using AI to generate a cool image for the start menu to give better initial impression. Allow the turret to rotate to shoot straight up. Add more enemy variety and upgrades for the player. Looking forward to seeing your next game!
Also, I think maybe Godot is overkill to start with, it could help to have a simpler engine that can iterate faster with AI. I recommend checking out LittleJS. https://github.com/KilledByAPixel/LittleJS