What I mean by this, is that the vibes that the deep dive gave of were way spookier than any other build of the game. It would be amazing if these were added back.
Firstly, the voice acting. I cannot tell who exactly voice acted Mr. Peterson in deep dive. It was either Armen Taylor doing a grumblier voice or another person entirely. However, I felt that it was much more fitting for the Neighbor, and made him much more imposing.
Secondly is the soundtrack and visuals, which were both quite different to the final game. The intro music for the Deep Dive was much eerier compared to the Museum themes we have now, as well as the inside ambient being more tense without the constant droning synth making the place feel more lively. The visuals weren't all that different, but the lighting was colder and darker, and some objects were slightly more rustic.