The art is fantastic (if unfinished) and the story generates some nice atmosphere, but on the whole, I feel like the game falters a little both on the level of idea and execution.
I think the "trapped in a metaphor escape room" premise hits most of the usual delights and pitfalls. The mystery is propulsive, the characters are given stuff to do, and the gradual escalation in weirdness makes for some good horror moments; but when we get to the character drama, it all starts to feel a little artificial because the situation is so blatantly set up to make said drama happen. In this regard, the characters having no idea what's going on maybe hurts the story a little.
Also, I feel like something this short really needs to land all the imagery connecting, but that doesn't happen here. The two biggest things are the drowning motif and being trapped in a basement, and how they relate to each other remains too vague for my liking. I was waiting for the basement to start flooding or something (though that might have been just due to watching too many Tsai Ming-liang movies lately).
Prose-wise, there are a lot of pretty good lines, but some editing and polishing would go a long way. Many paragraphs are broken up across text boxes, which is probably intentional but feels like an error and is hard to read every time; in a visual novel, you really want every line to be complete and self-contained.