That's good feedback on the instructions, and I'm happy to hear people like the concept! My main goal was just to submit something where people could visualize the concept of the game, so I could get some feedback on whether it was even worth trying to build out more.
As for the bullets, they definitely did have more feedback at one point, but they started phasing through the enemies without hurting when I gave the enemies movement, and I just didn't have time to fix that lol