I've written a complete multiplayer interactive fiction web game server in one quarter of the time I spent trying to get mastodon's lists working with sandestin. I also had more fun doing it.
Here it is: https://sandestin.deckc.hair/
(it is not fediverse in any way)
It's currently a free-for-all. No login required. And you'll have to hit F5 to see the latest game state.
(I am working on a websocket version which will push updates at players. Coming soon...)
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You are probably aware of long polling; it seems to me that this is very much a good candidate for that (and that makes all the jazz with reverse proxying easier, because it's just an http request).
https://sandestin.deckc.hair/