20 second PANIC

https://scratch.mit.edu/projects/761111143/embed

Controls:

Wasd to move 

mouse to aim 

space to shoot

Story:

Aliens have invaded earth, you have been drugged so that you will die in a few minutes but in your last dying moments you find one of their weapons, now you only have 20 seconds left, how many aliens can you bring down to the grave with you?