Not bad. It's kind of interesting. It could use a bit more depth, perhaps. The puzzles seem to focus more on putting obstacles and estimating the trajectory of the banana. You could add more puzzles like the one where you throw a banana at a fellow monkey and he throws his own to the target or perhaps another monkey and so on. Lastly, you could at least have put a "Next Level" button each time a puzzle is solved so that players won't have to go back to the menu. Saves a lot of trouble and minimizes frustration for those who aren't so patient.