Perspective from game tester and user-experience designer.
Found a couple of places where I clipped through the wall and couldn't seem to come back. If it was possible to come back, it was too difficult to figure out due to camera not changing for me to see how to orient my character or was obscured by other objects in game.
Not sure if I finished the game, or if there was a fail state or win state, I got to a screen where it seemed to imply moving forward, but as soon as I did I was quickly shown a screen that said something about figuring out the killer would require meeting the victim and then that screen wouldn't progress or change and the Esc key would only close the game.
Last minor note is that the game title on the opening screen has the same font and color as the menu options "play" and "quit" but neither are navigable via keyboard or have any sort responsiveness such as a "on hover" color change or animation upon click.