First of all, thanks a lot!
About your last point ... i had it work differently until a day before the submisson: if you ended your turn in a tile adjacent to an enemy they would spot you. This mechanincs alone redefine the whole game and you had to think twice before move. A friend tested it, didn't understand it and kept asking "why do enemy spot me even in shadow?" ... that's solid and i could not come up with a better solution then to remove it. It's easy, but that's not as bad as i though 8p.
Someone mentioned difficulty levels, i'm thinking about a future release where the "one tile spot" could be in maximum difficulty.