A few of us would like to do a shout-out thread, to highlight game devs that do a great job treating us customers first class. Please post <dev company name> - <game title>.
Because they need our recommendations to spread among the customer community; let's give them a hand. And lets others know some devs/games to consider playing. So this thread is to give kudos, thumbs up, and share with the GOG community who we love, who has been good to us!

Devs who make their game a comprehensive positive experience because of their product quality plus their involvement, attitude and support.

For example:
- being highly responsive to the user community,
- keeping games updated as needed,
- answering emails or discussion on bugs,
- ongoing website and information to encourage, inform, and help play the game,
- supporting game-specific discussion forum by monitoring and commenting (e.g. on website, GOG, subreddit, discord, or whatever),
- handling inquiries in a positive, professional manner
- polishing/patching the game code after publishing, to improve it and reduce bugs
- explaining business decisions to continue or to stop further development
- Other stuff I haven't thought of atm... but you get the idea.
EDIT:
- SOFTWARE QUALITY - i.e., quality of finished product in how smoothly it runs, how well it is designed in its user interface, quality of the game design, and quality management of ongoing patches and updates. Some games are buggier than others. There are many aspects and challenges to producing quality games and ongoing support.
- Full features published on GOG - doesn't limit new features like expansions or coop to steam, for example.

So some devs do an outstanding job of this. It's a LOT of work on top of their regular dev work, so that takes extra labor and budget. Amazingly, some very small dev houses, even a 1-man shop, can do an outstanding job. Some small dev houses don't. Some big dev houses do a good job, some don't.

Would just like to shout-out and give kudos to the devs that treat us great, have great attitude, and go the extra mile after publishing their game.

https://www.gog.com/forum/defenders_quest/defenders_quest_linux_version/page1

https://www.gog.com/forum/defenders_quest/adobe_airless_build/page1

https://www.gog.com/forum/defenders_quest/announcing_dq1_hd_special_edition_free_upgrade

Here are a few we discussed as highly positive, responsive devs:

Team Cherry - Hollow Knight
Butterscotch Shenanigans - Crashlands
Windy Hill Studio - Orphan
ConcernedApe - Stardew Vallley

Please post more "First Class Devs"/games! Great devs need our support and recommendations!

DarkGod of Tales of Maj'eyal is also awesome and super involved.

Clarus Victoria, the devs of Predynastic Egypt and Egypt old Kingdom were quick to respond and friendly. Plus their games support Linux and they provide Demos, which unfortunately isn't the norm anymore.

I'd shout to Buckshot Software - of Project Warlock.

Really?

Subset Games with FTL and Into the Breach.

I'm very happy with Event Horizon and Tower of Time so far.

Dave Gilbert (Wadjet Eye Games) has a very positive attitude and involvement in community discussion, is pro DRM-Free (their whole Steam catalogue is here), and was very polite and prompt in responding to a previous e-mail. Here's an example blog entry going into far more depth with marketing and community interaction than most devs do ("So I went to the fans directly and asked the obvious question: “So why did you choose to play Gemini Rue instead of Blackwell?...")

All THQ Nordic games seem to be up to date and they update their games very fast + they also release new games like darksiders III and other new games here.

Not true. They brought DRM to GOG with their shitty people-exploiting "game" called Gwent.

Flashback by Anuman Interactive and Paul Cuisset and Gekido Kintaro's Revenge by NAPS Team debuted exclusively on GOG (for the PC versions).

THQ Nordic definitely treats GOG customers like second-class citizens by not giving Achievements to some of their GOG games whilst those same identical games on Steam do have Achievements.