Graphics are good, but when the crap lays on the target's head, it appears quadrupled in size from when it was airborne (and kind of looks like a hat). This is just with one bird's crap, so, perhaps, the end-size always assumes that all three have successfully dropped a load.
Crap supply is abundant and doesn't feel rewarding to use.
The game is too repetitive. For instance, the distance of the obstacles is the same each time and there's only one target sprite to crap on. And that one target is hopping up and down in place, instead of walking. Obstacles all look the same.
It's definitely a concept, but seems incomplete. With three birds should come three different obstacle dynamics and different ways to earn something for passing the challenge. I found myself dropping two of the three birds and just playing with one. Why keep all three? More points? Well, the point system isn't satisfying enough. And there's no consequence for losing two out of three birds.
So in summary, players have been given the option to play the same game three times at the (approximately) same time. If the challenge ahead was something that required more birds than one, then this would change. But multiple instantiation is all that's happened in this concept. It's just Flappy Bird with a non-essential extra challenge (dropping bird crap). However, it had a good first impression, 'cause it looks good.