A note on program peddling
I would wager that Six or More times as many people would pay five dollars for this game's 3d fullversion than would pay 20 bucks for the very same. Heck! for twenty dollars, you'd likely make more if you distributed for free and placed a humble donation link somewhere out of sight that you mention only once during setup. People dig that sort of thing.
Still, neat little game, with a nice feel.