Space bar drops 3 bullets behind you. Consumes about 50% ammo.
Improved scoretable security. Have at it.
Enemy ships now operate as a team, and will occasionally fly in formation. Take out all 3 ships in a squad in under 2 seconds for a 500pt bonus.
Shield boosters now restore 20% instead of 15%
Enemy ships now collide with asteroids and will try to avoid them.