Phenomenal idea.
Well executed, clearly presented and hook is obvious immediately.
Could be expanded upon to work as a commercial game, if you ask me.
Some specific feedback:
- It would have been nicer if the levels don't start immediately but after a "start" button so the player has some time to orient themself, but arguably that's polish nitpicking.
- The thief was still a little too hard to see on cameras in my opinion.
- I expected the guards to follow a path I would draw for them, not the shortest path available between them and my cursor. I don't know if that's a design decision or consequence of programming limitations. I think if you decide to take this game anywhere in future the appeal would lie in the puzzle aspect, and for me that would work best if I can draw little routes for my guys to patrol. (If that makes it too easy, perhaps they can be distracted by sound, too.)