Press green flag to start. Use up and down arrow keys to move. You can not move side ways! Fire small missile by pressing space and fire big missile by pressing "z". The big missile will only take down the big space ships. Remember to hold space bar for the missile to travel further. Also if you move up or down while firing a missile, it will cancel out. Also you can only fire one missile at a time. Pressing "C" will fire you machine guns-these are at the top of the ship so it will only kill falling aliens. Missiles will explode on impact - if it is a miss then they will continue and bounce back. Don't worry, there is no friendly fire so it will not harm you-only the enemy space craft. When you come to the "Death star" press x to get a force field. This doesn't work with smaller space ships' bullets. See how many hits you can get. Good Luck!
We do scratch at school and I would like to thank my friend for inspiring me. Don't worry about the aliens. You can shoot them if you like! (the ones in the space ship anyway. The one that fall from above shoot them!) Although you might need those aliens later on-best to leave them!!! Post your score on the commenting. Also post any ideas.