press left arrow to move left and right arrow to move right.Space key to shoot.you have 50 lives.There are 3 levels.Level 1 contains yellow aliens after 10 kills you reach level 2 and it contains blue aliens and after 30 kills you reach level 3 and it contains red aliens.To win the game you need to kill 50 aliens without losing 50 lives.As level increases speed of aliens also increases...
Check out my other space game- https://scratch.mit.edu/projects/430477949 Thanks to cooltext.com for the thumbnail text
