Arrow keys or WASD to move. Red things hurt you. Click to shoot a blue thing. Blue things kill red things. Touch a yellow thing to gain invincibility for 25 seconds. Go to the original project if you think this is unaccurate. If you reach a score of 15000 then two things will happen: One: Something will happen. Two: You will realize that you have way too much time on your hands.
Credit to FUZZIE-WEASLE for the original project. Remember, New Scratchers cannot change highscores.