Hi! We're actually approved to go on GOG, I'll check with them if we should have a landing page of some sort before the game is launched on January 24, 2018. Thanks for letting me know!
You definitely should, if they did; they have a number of similar pages for various games still in development.
There is a potential issue, though, with their TOS on purchase of such games: quoting from their FAQ ( https://support.gog.com/hc/en-us/sections/115000157529-FAQ-Games-in-development#... , 'What is the refund policy for games in development?'), '... Technical issues covered by the 30 Day Money Back Guarantee do not apply to games in development. Instead, you can return the game within 14 days of your purchase...'
In clear, that means that the period to get a refund (if there is an issue with the game) typically ends long before the game is available... fairly illegal terms here (consumers rights issues), so those pages are mostly advertising the game, I do not thing that many people buy early from them under those conditions.
I've reached out to them regarding a "coming soon" page, but our current demo (still in development) won't be available for purchase via GOG because it's free! So Legrand Legacy will only be available in GOG for the full version.
Demos are treated differently on GOG, they have separate page entries from full games; I could find you a few examples if you need.
Games in development listed on GOG can be pre-purchased, basically (at least most of them, but I remember some with prices marked TBA, therefore you could not purchase those).
You should be able to see us on GOG now!
I Just tried, used GOG's search page with the full game name first, then just 'Legrand' then 'Fatebounds", all 3 searches got the message 'No results found'.
I will check again when the release countdown expired on your website.