Well is it random though?There's an interview where a dev explains that there isn't a master plan. Instead it was just each individual dev haphazardly putting in their own mysteries.Spoiler for Hidden:
I like how open to interpretation it is though. The gameplay and visuals/animations as well are very fluid. It looked great even on Switch.
Sound effects really good too. Like water sounds and everything being muffled when underwater. Sounded realistic
Spoiler for Hidden:
Sounds were great. They went into a lot of effort to sync them between deaths, instead of having a hard reset.
For me it's a 7/10 (5/10 is average). Fun game but no real meat to go along with it.