eh, its okay.
I'm impressed you made it in flash... i could never get the hang of AS though I hear AS3 is a lot better for programming perpouses. it was, well, very very basic, but a good solid start. controls are too precise... for lack of a better word... add some float to his movements. instead of just moving when a button is pressed, give him some momentum so he doesn't just stop dead when a button isn't pressed. it was most noticable when jumping. I'd let off a key and his movment left or rigtht would just cease to exist. other than that, I'd say you've got the basics of a platformer down. but his animations were somwhat unnoticable, however. I couldn't tell he had any walking animation at first. i understand its a demo, but animations are typically complete during teh "demo" stage.