It's beautiful, but really boring to play :
While jumping requires waiting the bird to get right next to you, bending down doesn't have any disadvantage and quickly becomes the default action. This really underlies the main challenge of the control switch as it allows you to always keep track of what the right action is.
Also, be cautious with simple random events : I got a high bird six times in a row; lack of variation is the last thing you want from that kind of game.
On a good note, the backgrounds gives a great vibe.