Received email regarding the outdated Hyper Light Drifter Linux version, at least this one sounds positive:
Hi <name>,
Thanks for reaching out to us. We are indeed working on implementing an updated version of HLD for the GOG platform! Please feel free to follow our Facebook page for the latest updates.
Thank you again for your feedback!
I wanted to email Klei about their disastrous GOG (lack of) support but I don't think it will have any effect, regardless of platform.
EDIT:
Also received an email from the dev of "The Signal from Tolva", it was a short one, they said they're looking into it.