I'm glad you enjoyed it. I have to say my intention wasn't to be evil, more that I only had 12 total collectibles, and if I handed them all out in a straightforward way, the game would basically have zero longevity or replayability. If i'd really wanted to be evil, I could have included some blind pitfalls (including ones of that drop you out of the whole map), or made pits you could fall down and not get out of. =P Also, while the destructible walls aren't marked, they don't have any crystals on them, as you can't destroy those.
What you're saying about the double jump (or as I like to think of it, 'jump jets') makes sense. I didn't have any space for explanation (I mean, the game's title doubles as an explanation of your objective) but I had hoped the deep pit you have to climb out of in the green quadrant would help players come to grips with it.