No one will recall my first attempt at a platformer; literally no one saw it before I updated it to what it is now. Thanks SO MUCH to griffpatch for pushing me in the right direction with his platformer tutorial; I think I'm ready to make a game of my own now. Use arrow keys to move, and type DEBUG to enter debug mode (see the cat's hitbox, and the variables that allow. Drag the platforming around to test out the different platform types; I've yet to program his reappearing at home when he falls off-screen, you'll just have to click the green flag.
Thanks to practically everyone else GOOD at Scratch for creating platformers that I'd like to imitate.