Little Updates.

Cleaned up some of the astroid spawning. Feels better.
 Adjusted some numbers.
 Set up some code/gfx/sound for some suture updates.

TBD:
 Death explosion.
 Powerups (at least two planned: shield and drill). Debating lives system.
 Another fuel type (one adds a lot of fuel, one adds a little).
 At least 2 more audio tracks.
 Moon Landing ending state. Moon background lowers toward the end of the run.

 A Highscore Page. The highscore would be Time to reach the moon, or Distance - Time