!sillydrawingrequests@sopuli.xyz

(probably – if anything)

The Expression Amrilato is a VN that’s mostly in Juliamo (i.e. Esperanto with some modifications like a custom alphabet). It’s mostly an Esperanto tutorial though with an isekai yuri plot.

Disney’s Atlantis had a custom conlang specifically made for it, but IIRC the dialogue was mostly in English still.

If it doesn’t connect to the internet, it should be able to just keep doing what it’s doing indefinitely. You will eventually get a significant amount of clock drift if it can’t update the time from the network but you can manually set the time once in a while to fix that.