A similar (and undoubtably simpler, although still often infuriating) but still fun logic/programming game is Manufactoria[1].

Spoiler: Vg'f onfvpnyyl cebtenzzvat n uggcf://ra.jvxvcrqvn.bet/jvxv/Gnt_flfgrz

[1] http://pleasingfungus.com/Manufactoria/