Sounds.

I might be wrong on this but ehhh people will correct me. I have around 230 hours on this amazing game and have got 100%. However, there is one mechanic me and my friend were hoping for the entire time: enemies that can hear you. When I was scrolling I learned about >! the coworker !< and stopped reading as to not spoiler what I hoped was a mimic. Sadly it is just a silly little guy who likes coffee in his coffee hole. We also thought that >! The Reaper !< could here you bec7ase we talked and that is when it appeared and attacked, while when we were silent and whispering it didn't. We were wrong TwT. My question still stands though, are the are any IS-es or anything else that can hear you? If not I think there should be.