newest game by Spiderweb Software:
https://www.kickstarter.com/projects/619141553/queens-wish-the-conqueror

Some adventure games or adventure kind of games which are currently on Kickstarter (some ending very soon):

Sol705

http://www.kickstarter.com/projects/782397044/sol705

Project Sense - 不祥的预感: A Cyberpunk Ghost Story (relaunch)

http://www.kickstarter.com/projects/2030067069/project-sense-a-cyberpunk-ghost-story

Life of Delta

http://www.kickstarter.com/projects/2027554242/life-of-delta

Tala - An Explorational Puzzle Game (relaunch)

http://www.kickstarter.com/projects/1185453478/tala-an-explorational-puzzle-game-relaunch

Crime Code - detective adventure

http://www.kickstarter.com/projects/1280964996/crime-code-0

Kickstarter campaign finished, but there still seems to be a PayPal option available:

Backbone — pixel art detective adventure inspired by noir

http://www.kickstarter.com/projects/106061903/backbone-pixel-art-detective-adventure-inspired-by

Iratus: Lord of the Dead
kickstarter.com/projects/2107948460/iratus-lord-of-the-dead

Demo available here:
download.iratus.org/static/Iratus_Demo_010.zip

XENONAUTS 2 : Strategic Planetary Defence Simulator
kickstarter.com/projects/69341191/xenonauts-2-strategic-planetary-defence-simulator

Crying Suns
Kickstarter
Gameplay with Christopher Odd

Fully backed, going for stretch goals.
Demo available through main site.
Priced at $19.99 as of this post.

Real time tactical space combat (with pause). Looks sorta like FTL with more hand's on combat.
Upgrade your squadrons and main base? Looks like it'd be fun.
No word on GOG support though...

Added links.

I think this hasn't been mentioned yet:

SEGA® Master System: a visual compendium

Welcome ようこそ

Welcome to our Kickstarter campaign to create an officially-licenced coffee table book on the SEGA® Master System™. The book pays tribute to the amazing pixel art, product design and graphic design associated with this iconic 8-bit system. The book is officially licensed by SEGA and is the first book of this kind to be released for the Master System, ever.

This will be the sixth visual compendium from Bitmap Books. Previous titles in the series on the Commodore 64, Commodore Amiga, ZX Spectrum, NES/Famicom and SNES/Super Famicom have all been met with critical acclaim, most notably with the ZX Spectrum book, which won gold at the 2016 Roses UK Design Awards.

http://www.kickstarter.com/projects/2146199819/sega-master-system-a-visual-compendium

I've seen the following reply from Alt Shift in the comments section (on KS):
"Pour GOG, c'est en cours de discussion avec eux, mais rien n'est encore fait."

Approximate English translation (pardon my rusty french :P):
"Regarding GOG, we're currently discussing it with them, but nothing is finalized yet".

This basically.

Starflight 3 on Fig:

https://www.fig.co/campaigns/starflight-3?mp=promo&r=preview

CODE OF THE SAVAGE

https://www.kickstarter.com/projects/2106227726/code-of-the-savage-rpg/

https://www.codeofthesavage.com

The Dev: "I'm making a classic style western RPG that's inspired by some of the great role playing games of the golden era of gaming (80's-90's)."

From game's site: "CODE OF THE SAVAGE WILL BRING YOU BACK TO THE GOLDEN AGE OF RPGS. A NO-HOLDS-BARRED CLASSIC WESTERN STYLE RPG."

https://www.indiegogo.com/projects/vakondok-4-gyujtoi-kiadas-40-oranyi-extraval-computers#/

Now this would be a movie that i would buy on Gog .

This one seems interesting - Sierra Pharaoh inspired

For Eternity - Imhotep's Children

https://www.kickstarter.com/projects/hkinteractive/for-eternity-imhoteps-children/description

Not yet, but on September 5th, a potentially extremely interesting kickstarter:

Nighthawks

"Nighthawks is the new urban fantasy RPG from Wadjet Eye Games (The Blackwell Series, Unavowed) and writer Richard Cobbett (Sunless Sea, The Long Journey Home)"

The Sundew
"The Sundew is a 2D retro-style point'n'click adventure game that will take you into a dark cyberpunk world where the boundaries between good and evil become blurred.

The prototype and the story of this game have been strongly inspired by classic LucasArts and Sierra’s games but also by new representatives of the genre (Wadjet eye games, The Last Door, ...), cyberpunk worlds and Sci Fi authors like Philip K. Dick and William Gibson."

Seems original and interesting, especially the graphics and inspirations.
It should be coming in DRM free versions so i'm hoping for a gog version :)

Cyberpunk/Sci-Fi point'n'click adventure? Say no more! Backed. Thanks for letting us know!

Plus DRM-free, Linux support, and a ridiculously low entry point for a copy of the game (even without the Early Bird discount)? Backed as well!