Left and right arrow keys move and space bar to fire. Shoot all the bugs before they get you. It gets harder as you go. You only have 3 lives.
This game is based upon the classic arcade game galaga. It uses cloning a lot and runs very smoothly and fast despite the number of sprites/clones.
The number in the middle at the top of the screen is the high score and uses cloud variables, so can you be the best?
If you prefer space invaders try this https://scratch.mit.edu/projects/90937233/