The sound design is lovely, the mermaid's song reminded me of The Windwaker.
One bug I encountered was if you get caught by the security guard after passing it with the mermaid, the player spawns past the guard, but the mermaid spawns before it so you can't continue. I encountered it because I backtracked through the hallway while exploring and got caught before I even saw the guard haha. There's also a few puzzles where you can't see what exactly is changing which fixed cameras should try to leverage, but tbh it didn't really hamper the experience for me that's more of a polish thing.
Loved what your team made here! The design is elegant and the atmosphere is cohesive and nostalgic. Great job :D