I enjoyed it
However, its not a great game by any means. Theres not much content. Every level was the same thing. Im not sure how you could improve, but i got a strong feeling you were trying to emulate a sonic game.
One suggestion i would make is improve your voice acting, Moovlin sounded dead. Also, the city level was horrendous, and difficult to look at. It seemed scattered and confusing.
Most of this could easily be solved by improving your graphics, but as this is your first flash game, im not sure how good your art skills are, so im not deducting any points there.
Im going in circles i think, basically, your voice acting needs a lot of work, and you need to add more content. I also found no use for his crouch jump.