Seriously?
3 stars for making a game that works and looks decent. Here are the problems:
Provide real instructions in game if you're going to make the buttons correspond to the shape of the obstacle. You have to do it through trial and error otherwise.
Slow the speed down on level three and/or fix the color/background. Pink obstacles on top of slightly lighter pink bushes on top of the same color pink trees on top of the same color pink backdrop causes a huge blurring effect at that speed. The first two levels have a similar but less annoying problem since they're at the right pace.
Make the right button obstacle totally different from the left button. It's near impossible to tell them apart before it's too late, especially with color blurring and the speed.
Maybe throw an indicator on what button to press instead of what button you're pressing, at least during the first 3 levels.