Arrow keys ? movement
Space bar ? fire
4, 5, 6 ? special attacks
1, 2, 3 ? change weapons
P ? to pause the game
HUD:
Green meter is your health
Blue meter is your shields and will recharge if you do not take damage for a long enough duration.
Right orange meter is your special meter which after using a special will recharge after a time.
The left empty meter is your heat. If you fire too much it will slow down how fast you shoot and you cannot fire the laser when at max heat.
Items:
Small blue ball is points
Large blue ball restores 10 shield points
Green ball restores 10 hit points
Purple ball reduces heat to zero and sets special up to max and makes you more heat efficient.
Orange ball increases power for all weapons.