Nice job. I like the Atari 2600 retro aesthetic. As someone who has practically made his entire arm go numb spamming the fire button in games like Galaga and Space Invaders, I also appreciate the auto-fire.

I might suggest reducing the "vertical jitter" in the enemies. At first I thought it was a glitch but I think it's intentional.

I agree. I pressed space to fire and was surprised it pauses the game.