Lovely
My one year old daughter loves this app. I cant speak for older children, but the simple input scheme (tap anywhere on the screen to advance) allows this to be the first digital toy she has meaningful interactions with. Its also educational and beautiful, which makes it all the more pleasant to "play" it with her. (I personally find most apps aimed at toddlers to be poorly done and kind of painful.)
For people complaining about the length, its true it lasts only about five minutes -- but my daughter often wants to play it a couple times in a row, and has played it almost every day for over a month. Not a bad deal for a little pleasant, quiet time together.
Eddybox about
Peekaboo Forest, v1.1.0