Well done.
This was a rather decent first flash you got there. You added different things to keep it interesting, and even the last room wasn't incredibly easy. The only criticism I have is the length: it's too short, but since this is your first flash, I'll let it slide. Like I said, well done.
It's fun.
It's pretty good for a start but over too quickly and you could add a few things to it to keep it interesting if you decide to add more levels. Maybe some pickups that can change the physics or size of the ball which can make the game more interesting and add to the difficulty.
Great for a first game!
The Good:
+Alright gameplay.
+First flash ever? Really sick dude!
The Bad:
-Stylistically it could use some improvement.
-Really short.
-Needs a menu/difficulty settings/level creator/etc.
Final Words: You have some major promise as a game creator! Keep working on it, looking forward to seeing more of your work.
Verdict: 3/5
Eh...
Decent game. You say this is your first? Very good in that case, if you plan to make more games, make them a bit longer. But good job on your first game.
Decent attempt I suppose...
But there is a such a high standard set by other talented artists on newground that pieces of work like this will never go too far...