That's weird, you should have 1 damage at the start of the game, and the smallest asteroids have 5 HP so it should take you 5 hits to destroy an asteroid at the start. If you could i'd like for you to try it again and confirm that it's still happening because other people that have played it said nothing about not doing damage at the start.
I wanted to do a tutorial but didn't have time at the end, the controls are pretty simple tho, you move with wasd and that's it, it autoshoots aiming at the mouse.
Yeah i want to keep working on it when the jam ends.
Thanks for taking the time to try it out!