This is an amazing game. I paid 4 euro for it but would've easily paid 10. The artwork is beautiful, the tree generations are great, the nature vs city concept was implemented very well and reminded me of flowers. Along with the zen gameplay of course. At first I thought the 'random' tree generation would become troublesome in later levels, but it's not as random as you would think. It's carefully designed so its perfect for every level. Learning all the mechanics is a joy.
The AppStore needs more if this. If you're still reading this, go buy it.