Description: Destroy the attacking UFOs, win points, and go to next level. You can update the strength of your fighter after every level.
Instructions: Move your fighter by using left, right, down, and up, arrow keys.
Fire your rockets by pressing the space bar.
If your rockets hit the enemy you earn credit points.
If the enemy rockets hit your fighter your fighter strength gets reduced by a certain percentage. If the strength becomes zero the level ends, and you have to play the same level again. If you hit a certain number of enemies in a level you go to next level.
