I recommend full screen. Click green flag to start. You are gray ship. Enemy is yellow. Use up arrow to move up and down to move down. Press 1 to shoot high gun, and 2 to shoot low gun. When you shoot you will stop moving (unwanted glitch ;-[!). The enemy will move up and down the screen, shooting both guns every 2 seconds. When a gun is hit 5 times it will break and vanish (your guns and enemy guns). When you hit the enemy ship body 10 times you win. If the enemy hits your ship body 10 times you lose. Enjoy!
Please tell your friends and remix!