The environment design is well coordinated and I personally like it!
I feel really was scared each time when I was found out by the guards. But honestly say, I am not sure the use of the bones do the work or not. Because tight tps perspective makes players tend to run blindly, and almost all cases it works very well than they expected.
So, maybe for the puzzle game, more distant camera does a good work. I think providing broad eyesight makes players to think carefully about the course of action.
However, I want to say one more time. It's aesthetically good!