This game is looking extremely good, it's hard to find quality liminal games and this one is at the top with Superliminal, The Stanley Parable and Beginner's Guide. My favorite parts are definitely the reservoir areas and the pink pools area.
Here are some things I'd like to suggest:
- there seems to be a heavy noise filter applied to the game mainly in the lower lit areas, I'm not saying to remove it entirely but sometimes it does seem a little over the top and makes things hard to see, I'd suggest making it a little weaker
- while I love the idea of using the industrial panels to control the doors, the execution is in my opinion kinda meh and it feels like playing among us also it doesn't really fit in with the atmosphere. I'd suggest modeling them like real industrial control panels, switches, indicator lights, emergency stop switches etc. Then there could be like "door override" rotary switches, which would open the doors, maybe some additional water feature controls just for fun and for people to explore. If you need inspiration just look these industrial control panels up on google images, I'm sure you will find a ton, but they can be easily spotted in real life also. To implement the puzzle element you could maybe have the player search for a key to open the panel, this would keep it realistic. Having the panels made like this would beautifully compliment the whole atmosphere of that level.