As far as I can tell, I have no incentive to move my balloon up unless absolutely necessary to dodge a bird, so I just end up camping near the bottom, especially considering that the balloon tends to get way too big at times. Also, the game is way too difficult. It's hard not to die within a few seconds.
With that said, there's an interesting idea in here: a racing game where you can make your hot air balloon bigger to make it reach its goal faster, but at an additional risk.