Simple

I had bigger plans for this game that I would never be able to follow through on, and there's no ending or story or anything, so in that sense it is unfinished. But what's there is a decent little time, if small linear tricky platformers are your thing.
A couple levels were contributed by people on a forum I frequented at the time. (I was going to abandon it, but one of the forum members yelled at me to just release the game with the levels I'd finished, so, years later, here it is.)

Use the arrow keys, and remember to double-jump!
You can press F4 to go fullscreen.
Press Shift to skip right to the next level. There's no "previous level" button.
I also left in Game Maker's default saving/loading via F5/F6.
Pressing Q will immediately quit! There is NO progress tracking!