Hi I'm sorry. I didn't have time to put it in the game, but in the itch.io page you can find the controls for the game. You need to hold space to shoot and q/e to rotate. The arrow shows you the direction you're spinning and the place where your "bullets" shoot from. The "lives" is how much matter you have stored. You shoot your matter out at the enemies, and when you get hit by the enemies they "steal"/mine matter from you.