W S OR J I TO MOVE UP AND DOWN (and you also can technically use a controller with scratch addons.) AVOID EVIL CATS HARD MODE: https://scratch.mit.edu/projects/825835249/ If you think this is too easy, try hard mode! enemy's move faster than you and they spawn at random positions, so they are unpredictable.
I found a video that i watched a while back and based this game off it (and no i didnt watch it a second time) so some of my code may be a little different to the original.