Well I must say that I really like the game and it can only recommend each has a slightly higher limit frustration.
The mere fact that there is a Deathcounter of all deaths worldwide one already says a lot about the game from (current level 1 billion +).
However, I like the game very much and each says the other games too easy for him are served here well. I think one would be too soft for this game, I recommend rather the far lighter Skyrim.