'The Darkening' made me think of action...
Not much to say about graphics, they were perfectly functional but not mind-blowing.
Likewise could be said about the style.
I liked the music - despite it being elevator-like, it was pretty good. Maybe you should have had a choice between three tracks.
I gave ten for interactivity, as it's such a novel concept. The gameplay was easy to grasp. Maybe you should have been able to get hints on every move.
Overall I gave this six out of ten. This is because the gameplay can't pull the game by itself. The graphics and style of the game were passable and it's a hard concept to do. If I had designed the game, I would have had it so that the board of the game was a building and as you complete each puzzle, you move to a different building. Something like that.
I can't constructively criticise much, as it's only the graphics and style which brought it down.
4/5 for the gameplay, but 6/10 for the review (because of graphics).
Looking forward to more games, hope this was of some use.