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I have every Wadjet game except Shardlight here on GOG, but I happen to also have Gemini Rue on Steam from a bundle. Back in April, Wadjet released a major update on Steam. A couple of people asked when the GOG version would be updated on the announcement page and on the Steam Froums, but so far Wadjet has remained silent.

I decided not to pick up Shardlight while it's on sale because it makes me wonder if their other games are being neglected here.
I am interested in this update as well. But apparently GOG is neglecting updates to non-major titles, this has never been answered or resolved as well. But hey, we already paid, why bother.