This is a really sweet app. If your kids love the Lorax books as mine do, they will love this. But even if they don't know who he is, they will still like growing plants. My two-year old only needed to be shown how to do this a few times and now he can do it on his own (not much reading required). My four year old can play it completely on his own.
You plant seeds and care for them and revive the forests. It's happy and cute.
The only user interface problem, is a little button by the bottom of your forest that says "Regrow" which means it deletes all your hard-earned trees and flowers and you can start over. I think that should be tucked into an options menu. My son hit it by accident once and was really disappointed that he had to start over. Definitely worth the cheap price :)