1. Use W, A, S, D to control the spaceship, press Space to shoot. 2. Fuel starts at 15, decreases by 1 per second. Game ends when fuel reaches 0. 3. Touch falling fuel bottles to add 15 points, maximum is 30. 4. Hit enemy spaceships for 5 points. Planets need 2 hits for 10 points. Hitting allies deducts 10 points. 5. Colliding with enemies loses 15 fuel points. Colliding with allies deducts 10 points. 6. Negative scores are allowed. 7. Press M to mute/unmute sound. Start your space battle!