I liked the concept and was able to beat couple of levels without overworking my fatigued brain. I really appriciate the ability to unlock all levels from the get go, so I can skip to later ones and see the game in full even if I don't have the brain power or time to play through it from the begining. This is very helpful in a jam.
I had a little trouble with undestanding how mountains worked at first, but once I grasped the concept it was easy to exectue.
I would say that the nicest thing about the game is that while it is puzzle to a big extent it isn't a 0/1 puzzle game. What I mean is that beating the level isn't a puzzle it is rather granted that player will be able to do it with some thought, but the real challenge comes from the turn counter.
Cheers and good luck