Snappy controls, nice music. (Though like a certain dinosaur themed game it could stand to be looped for those of us who take a long time to complete level 1.)
It would be nice to be able to review stats of each stage on the main screen, so I could show off my zero deaths on Level 2 instead of the one above.
I had trouble coming to grips with the wall jumping, which is not the game's fault. However, it led me to discover that most sections like that could be passed by climbing up one specific wall rather than hopping back and forth between several. Perhaps it's a slower strategy, though.