There's a PC version of the game I made before this, if you didn't know. It's basically the same exact game, but with a better resolution, and proper keyboard controls.
I really only made this mobile port because a few people had asked for one. I'll put a link to it in the description.
Thanks! I'll add controls in the next update, it shouldn't take too long. Also, about the asteroid thing you said. There are larger brown asteroids in a later level that can damage you, but I'll try to change the background ones to blend in better.