@mantsje, @alexsolonnikovp4, @belzeboss, @gamescodedogs, Thanks for awesome feedback ;)
Originally we wanted to add a power-up system to the game. For example, some asteroids could throw out abilities/skills when destroyed - such as a shield over Earth that would absorb some of the damage, or a faster Moon (with a rocket xd) or something like that. We wanted to keep Space button for triggering these skills. Unfortunately we didn't have time to implement this system, which is a shame because we even had some cool graphics prepared for this. power-ups.png
Also i was thinking about moving the ship controls to the mouse (along with shooting on left mouse button). Maybe it would improve gameplay a bit.