A quick guide for the people that may want to play this one between now and when I wake up:
First section is World 1-1 from Super Mario Bros. You should be able to handle this, there aren't even any Goombas.
Second section (it's blue) begins by showing how the yellow arrows affect gravity. Remember that you can jump while you're held against a wall. On the freefall key section, remember that the yellow dots will let you slow your descent and adjust your direction to a degree.
Third section (it's purple) is some basic platforming at wacky angles. The very last jump in the third subsection is tricky, but if you don't think of it as a jump it's a breeze.
Fourth section (it's pink) is easily the hardest. It begins by sending you flying through a miniature maze, then pops you into a room with gravity in several directions and a sort of column in the middle that contains the route to the next section. The first set of platforms will probably take a few tries to learn to nail without getting sent back to the beginning. After those you must use reverse gravity to navigate a short set of platforms. The last two parts are easy, and don't really require any tips.
Fifth section is World 1-2 from Super Mario Bros. It's been split up into three sections due to my inability to properly visualize space. It's rather straightforward, though. The only hint I can think to give is this: warp zone.
If you want to go again, just jump off the platform with the crown and head straight left. You can't miss the elevator back to the start.
It would if I hadn't forgotten to turn sleep mode off when I went to sleep. Oh well. I'll remake another one sometime. I (like to think I) had a lot of good ideas going there.