For a beta test it was okay
it was okay for beta but isnt there a special place for betas? anyway even a bit of sound would have helped. Secondly i suggest you make some pickups (like a sheild) or 5 seconds to fly or something becasue its quite challenging. I would also have if you will make long levels some check points. When you save exlamation man or whatever you should have a little winning animation or something, Even fireworks in the background. Maybe if there will be multiple levels you have to collect other charecters like semicolon man etc.
This has quite big potential, and by the way your art is pretty good (perspective or whatever is nice)
MAx