Move with the arrow keys, jump with the up arrow or space key, hold jump to get to the dark green platforms.
It's just a prototype of me doing scroll X and scroll Y, also including walls. There's a weird glitch that happens when you switch from changing your Y position to scroll Y where you have to hold jump and land back on the platform while holding jump. That teleports you to y-0, and changes your movement to scroll y. somethinglikethat