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Opening a support ticket is not the right way. GOG support won't be able to help you here at all ... you'd want to contact the product team who is responsible for getting new games on GOG. Unfortunately you can't. You can however create a wishlist entry in the community wishlist and vote for it ... also inform others about that wishlist. It is however still unlikely that GOG can bring any game here if a publisher is not interested as well.

Anyway, I noticed there are already wishlist entrys:

https://www.gog.com/wishlist/games/fault_milestone_two_side_below
https://www.gog.com/wishlist/games/fault_stp_lightkravte