Tips
It's not too bad of a game, but there is a number of things you can improve on.
IE: Have it so you can speed up and move up and down at the same time. Another thing is how if you're jumping in the air already, and press a direction, you'll immediately come back down.
I work with Actionscript a lot, so if you ever needed help with bugging these sort of things, hit me up and I'd be glad to help.