Wow guys, thanks for the nice comments! BTW, this game is also free on the iOS app store (sorry, no Android).
Also, in the leaderboards of the app version, you can see if you can get the level done in the least* number of moves, so that's cool!
* least refers to the least number of moves I could get each level completed in -- if you get less, you've beaten the developers at their own game :P
@lsdfgs: Momentum Master lets you gain momentum because you enter a screen at a higher point than when you leave the previous screen, so Momentum Master II's way of gaining momentum is actually more accurate.
@daraegon: The only reason I can think of for up and down to not work is if the game does not have focus. Did you try clicking in the game first, then trying both z/x and up/down combinations?
@Mavin: High scores are only recorded on Kongregate and I don't think I've seen higher scores anywhere else. (Congratulations!) However it doesn't look like you completed the levels, and the total level time is documented on Kongregate.
Congratulations to everyone who got more than 1000 feet in Skill Mode and/or completed the levels! @fetterx: It's strange that your score isn't on the high scores list to the right. When you're logged in, play Skill Mode once and it should resubmit your highest score.