How would I like to read a game that you're not going to tell me what it's about?
How should I know?
If you really want someone's opinion, here it is:
I like ontological mysteries when they're well done. But making a story where the fun is figuring out what's happening means making a story where the reader can actually figure it out, a story where things end up making sense. It's really, really hard to write a good story of the type you describe.
Too often "symbolism" is just an excuse for lazy writing. You end up with a clusterfuck of "symbolic" phrases and images that no one but the author understands, and they sit back and chuckle at how no one else "gets" the true meaning of the story.
I don't like reading stories where I feel like the author is mocking me for not understanding what's happening, or where it seems that they're being vague just for the sake of confusing the reader.
I absolutely love that kind of story when it's well done, though: Pale Fire and Hardboiled Wonderland and the End of the World are two of my all-time favorites.
It sounds like you really only want to write this if you think you'll get to see people discussing it in the forum.
Go for it.