Arrow Keys Control Movement.
Up, and Down Apply thrust
Left and Right rotate the Dude
Space Bar fires the laser.
P - Pause and Unpause
S - Toggles Sound
Added Main Menu, with Test Flight time.
Added noisy satellite, worth 1000 points.
Added invulnerability power up. Cannot shoot, plow through asteroids!
Tweaked bullet registration.
Asteroidnaut received minor visual upgrades.
Asteroidnaut received Invulnerable visual.