It's a good concept, I'm not sure there are other these kind of games but I must have to admit this game have good concept, but every thing is behind a Ed, the progression is extremely slow and everything stuck behind a Xbox, literally for clicking upgrade you must have to watch ad, and this is so insulting that the game also have ad which it show whenever it won't, and that's why it's getting one star, because I'm not sure I have that much patience to play this game while this much trash ad