I’m trying to play it, but I don’t understand how to use the valves. I tried left-clicking and also using space, but nothing happened. Am I missing something?

Visual-wise, I think the visuals match this type of game; but audio-wise there was nothing to listen for, not footsteps nor ambient sounds, so I think it was a bit unalive. (The literal meaning of the word - not alive. Lacking life).

Spawned camped by this monkey 

I really couldn’t play the game. I found a valve but i couldn’t interact with it. I would suggest adding UI (List of Actions, Settings, Main Menu). But i really enjoyed the sounds and visuals, really good job on that!