Awesome art and really nice feel to the gameplay - love how the music gels with the caveman sound effect too. I had a lot of fun, I did manage to cheese the mechanic in the end however by staying in a lane and pressing space as soon as it reached either end of the bar - so it would be ace to see some difficulty improvements. That said I think this is a top game - well done!
PS. I really hope Man Moth is a Karl Pilkington reference :)