Your mission is to defend Mars from stray asteroids from the asteroid belt. Use the arrow keys to move and the space bar to shoot your laser. Each hit gains you five points, however each shot costs one point. If an asteroid gets to the far left of screen the game is over.
I made this as a Scratch teaching tool. See the tutorial videos here: https://sites.google.com/site/pdpscodeclub/scratch-lessons/space-laser-game