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In case it might be useful for someone: Inked was delisted from the GOG Store at some point between 2020-06-20 and 2020-06-27.

I took a quick look at Steam and found an update from the devs (titled Future of Inked):

Hey everyone,

We have an important announcement.
Recently we have signed a deal with a new publisher, which means a lot of exciting things for Inked.
For the PC version, this essentially means we will rerelease the game, but as a hugely improved version of the Inked you now know.
Based on all the community feedback, reviews, and our own greater experience, we will strive to give you a better game in every possible way, from vastly improved gameplay to the visuals.
However our cooperation with a new publisher doesn't stop there, and it will allow us to bring Inked to more platforms as well, bringing it to a wider audience and allowing everyone new and exciting ways to experience the game.
Because of all these changes and new things coming, to ensure everyone the best possible experience, we will temporarily make the purchase of Inked on Steam unavailable until the time of rerelease comes.
Keep an eye out here and on our social media for future updates.
Lastly, we thank you for your support and your patience, and we believe you will enjoy Inked when it returns.

Sincerely yours,
Somnium Games

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So let's hope the new publisher is DRM-free-friendly and that we see the game back on GOG, since it was in my wishlist :)
Seems to be available for purchase again over at the other place, the new publisher is Pixmain.
I just found this post. It sucks that it's not back at GOG :(