This was originally a flash game, that was ported a standalone game, that was ported to the Nintendo DS, then to the PSP that was then ported to Mac and Linux (although I think it's still just the original flash game being run standalone). Chances are the flash game will run just fine on the N900.

Merry Christmas:
http://static.onemorelevel.com/games/ngame.swf
Either open in the N900 browser, or download it and run with FlashLauncher application. Even more fantastic is the keys are remappable.