Great object hunt. I liked the interactive menu. I liked all the graphics and the audio. The spider webs were inconvenient, but not too punishing. Restarting was no big deal.
The only major challenge I had was that the window was pure white, so I assumed that was the end of the art, which indicated the end of the level. My own assumptions cost me time, since it took me a while to test those assumptions and actually try going that way. But, if other people are like me, maybe there's another way to indicate the presence of an open window. (Not sure what that would be).
While I'm nitpicking, I didn't love the invisible walls either. Climbing vertically on nothing broke verisimilitude in an otherwise very immersive sim. (But that's a very minor nitpick. And again, I wouldn't have a good solution for that.)
Good job. High marks.