Cool concept, I really liked how I could move without seeing me, so I had to position myself in the right place, look at the enemy and time it right to get past.
I think I couldn't really think ahead in this game, as I couldn't see as much as I thought I would. I would like this better and would have finished to the end if I could "see" through an enemies path when they weren't there, so for example in the first key level, if I could look right and see the key when the enemy wasn't between me and it. I don't know if that made sense, but I still really like the game!