I took the flashlight + the key and used the telescope but could not use the stairs downward. This feels like a bug. Probably it is only a barrier to indicate that something's missing but here should be a info message in this case. Or the possibility to retrieve something later. I searched the room three times but did not find more. My fault.
The footsteps could have been less artificial (but who am i to say that, my game has no footsteps at all). From what I see on the screenshots, the game looks interesting. And the music was good.
I refrain from giving a rating.