Credit to @The_Updator for a few ideas. Just use WASD keys. This is a very simple scrolling platformer engine, using clones. For developers: In the floor sprite code, there is a script with several "create clone" blocks and "true_mov" blocks. To create a new floor, first draw the shape, then use the "true_mov" block (x, y, costume) and then the "create clone" block. In addition, you may set the slope_local variable before cloning to allow for sliding down slopes (it does not have to be highly accurate). To create an overlay (which makes it look nicer) you can duplicate the floor sprite and then draw the redesign over the original floor shape.
