Thanks for your feedback! With more time I definitely could've done more on the balancing yes.
- At least the asteroids don't shoot at you unless you're relatively close. So in order to get them to shoot other asteroids you need to be at least somewhat close. I hoped that that would encourage the player to play more risky.
- And if you survive for more than a minute the asteroids will start to move towards you, adding to the difficulty. But they're probably too slow, as you can always outrun them.