The mechanics is quite different here. I believe Grimrock is "I move, you move" movement mechanics, and in this, the enemies moved in real time. Subtle but completely different gameplay as a result.
This is mistaken, Grimrock is realtime. I just booted it up to confirm; I don't even see an option for a turn-based mode, which would be handy, because the game is quite challenging and without deft and constant repositioning you'll quickly become spider food. :)