I like the idea, the trees are cool and the whole thing with the letters works well! I wasn't able to get very far, and I believe it was due to one of the following factors:
I'm leaning towards number 2
Hey man,Thanks for the feedback!To be honest I'm really not sure with the difficulty...I have feedback that "mission impossible" is easy :)
Haha, yeah difficulty is a tough one - you can never please everyone!