Great idea. Music will be stuck in my head for a while, sound effects are cool too. This fits the theme perfectly, great use of the limited colours you have. Sometimes the bottom pedestrians were off screen. I think there should be a slight delay before the game starts to allow the player to read the controls, or have them on the main menu. Personally, I think the bomb would have been better if it was dropped from the bottom of the ship which would allow the player to attack in two directions. Finally, I think the UFO should automatically blow up when the player runs out of laser, and bomb ammo, unless there's an end game I missed. Great game!