Looking at the Celestian Tales reviews and seeing that it was meant to be an episodic game, I went searching to find out what had happened to the series.
And discovered that according to
https://store.steampowered.com/app/684700/Celestian_Tales_Realms_Beyond/ another one is due out next week. [Edit:
delayed by another week.] At which point we'll find out whether it arrives on GOG, I suppose.
Further down the rabbit hole, I ended up at
https://www.ekuatorgames.com/ and it's... curious. Some of that is just the unnatural English ('Talking about the fantasy games, the discussion would be incomplete without the mention of the Dungeons and the Dragons'), but they also have a page on slot machines ('Jackpots are often the reason why casino players play without a soul'). No blog posts since mid-2019 though.