I didn't know about this game. It looks awesome!
[edit]I've found the demo in itch.io. Of course it is your decision but it would be cool if you update that version too.
I have Steam but I prefer GoG; may be you can talk with them. They're very nice people, they always answered me.
Also a Linux version would be nice too, and since you're using SDL it shouldn't be hard.
[edit2] Sorry for so many petitions.
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