Unironically this is a really good backrooms game with a good story, nsfw aside. Somehow it fits right in though, I thought it was really funny how the agent kept his mask on despite stripping off the rest of the hazmat suit lol.
Viewing post in Banged in the backrooms comments
If you mean you didn't progress until the ending, iirc you just find the creature's names by investigating the different things, it's a bit of back and forth between rooms, like a puzzle. You kinda have to spend a bit more time clicking around and stuff to find the entity's 3 names and it should be pretty self-explanatory after that.
Weird, I tried again and it worked fine for me. Did you check the boxes for the wrench to dislodge the key, find the dildo and then try the door?
Edit: I tried again and I think you have to masturbate with the dildo and let the dude in the hole thank you, then try the door. I think if you skip the sex scenes you don't even get to meet the agent. In retrospect I kinda like how it lets you choose if you want it to be nsfw or not.