A Reasonable Start...
The games dynamics are slightly flawed; you need the movements to be smoother as they would be in a hot air balloon, and not jumpey as though I was controlling a robot.
The balloon seemed to glitch a little bit as I pressed the right key and the balloon fell; as though it was flickering, though not a huge impact on the game as I didn't hit anything.
I'm not impressed that the game just finishes on a white screen with a continous loop of infuriating music - I should turn my speakers off while I write this :P
The game has a solid base, but you will need to improve the animations and add in more objects to get out the way off, as mentioned below by Rupe-The-Dupe. It's a good start; but needs much improvement to become a great one, to rival the likes of the original Helicopter game.