Well, one more thing I forgot to mention is since clearing level seems to be just surviving based on time, maybe consider adding some sort of visual and/or audio countdown to when the stage is over. Maybe flash a (transparent) 3, 2, 1..before the level ends? On pretty much all levels, its a bit jarring to be playing, then all of a sudden the level ends. This is just a nitpicking thing though.. Btw..normally I play games on the ipod without sound on..so if there was an audio countdown, I'd probably miss it. =P lol.