This was a great self contained little puzzle I could easily see being part of a larger game. The room looked nice, felt realistic and the character controlled well so I enjoyed exploring it. Everything seems normal at first glance but then you start discovering small interesting things as you take your time to look around which is great for these kinda games. The audio fit very well, honestly my only criticisms are little nitpicks such as I would have liked there to have been some environment on the horizon, and some interactions like the drawers had no audio but others did, or the light source for the double wall lamp was between the 2 lights, instead of 2 separate sources. But like I said those are only really minor things I noticed. The best part was the "ah ha" moment with the dart board, although I think if there was some way to figure out the order without having it spelled out would have been even more satisfying. Overall great job!
Edit: Oh also the menu transitions and how it existed in a physical space were a really nice touch! When I completed the game and it returned me to the menu I did lose mouse control so I had to alt-f4 out though.