Good start.
Far too short to be worth while.
Reviews for "FLASH FTW"
Good overall, but sometimes this green ball keeps falling over and over
good, now spice it with some cheesy music
Nothing too special and very cliche. I do think you should add more levels and make them harder. Something you might want to fix, on the last level it's really easy because you can just drop into the portal-like things without even having to dodge anything.
I'm sure these are going to be things everyone has already said, but...
Your collision detection sucks, try creating a smaller MC within your obstacles that accomodates for the fact that Flash recognizes ALL movieclips as leveled squares/rectangles.
Jumping distance is really low, makes game feel cheap in difficulty.
Your gradiant fills are ugly. Gradiant fills are probably best used with low contrasts.
Enemies and obstacles are at odds with the "gravity" expressed by player character, they need easing between stops.
Sound FX would have been nice, SFXr/BFXr are good tools for this.
Simple, smooth 20-30 second music loop would have added color, FruityLoops Studio is great for that.
Consider how your colors fit together...buy a color wheel. Also, make a palette for your project and stick to it.
There is very little here, and most of your code could have been easily copy-pasted from a tutorial. There is almost no personality, no style, here. So...I have a rough time seeing this as little more than a learning experience that you didn't really enjoy. Seriously, what do you want me to say? "Good job on knowing what a circle is, I admire your ability to think inside the box".
Oh, well...don't get me wrong, it's great you finished this, but it's got no soul.