Imperium Galactic 2:

https://play.google.com/store/apps/details?id=com.digitalreality.ig2&hl=en

There seems to be some sort of technical issue actually purchasing it from the Google Play store at the moment. I have no idea when or if it will be resolved. Google support says it is an issue on THQ Nordic's end. THQ Nordic hasn't responded to any of my inquiries yet.

Majesty: Fantasy Kingdom Sim (base game of Majesty Gold)

https://play.google.com/store/apps/details?id=com.herocraft.game.majesty

Shadowverse
https://play.google.com/store/apps/details?id=com.cygames.Shadowverse

Added now :)

It's not same thing . This game made by another studio after years . This list only includes original or very faithful ports

This game even not available on GOG . You probably you didn't understand function of this list .

You can get the Android version of Stealth Bastard Deluxe on the Humble Store (but only bundled with the PC version):

https://www.humblebundle.com/store/stealth-bastard-deluxe

After many tries it seems that IG2 is purchasable again.

Party Hard GO:

https://play.google.com/store/apps/details?id=com.tinybuild.PartyHardGO&hl=en

It's the same game as the PC version minus twitch interaction and the DLCs. It's only called GO because the name 'Party Hard' was already taken.

Added to the list :)

Found an Android VR version of "Layers of Fear" on Google Play called "Layers of Fear: Solitude".

Gog Link
Google Play Link

Also found an Android version for "The Escapists".

Gog Link
Google Play Link

Added them to the mix :)

Found 2 different versions for Never Alone on Google Play. The first one called "Never Alone: Ki Edition" appears to be the mobile version with touchscreen and controller support while "Never Alone for Android TV" has no touchscreen support but is instead designed to be played with only controllers and has an additional 2 player co-op mode. Both versions do not come with the "Foxtales" DLC which is included in the Gog version called "Never Alone Arctic Collection"

Google Play Links:
Never Alone: Ki Edition
Never Alone for Android TV

Gog Link:
Never Alone Arctic Collection

Found a bunch more! Google Play links below.

Hatoful Boyfriend
Brothers: A Tale of Two Sons
The Inner Circle
Her Story
Kathy Rain
Pajama Sam 1
Pajama Sam 2
Pajama Sam 3

Note: On Gog, Pajama Sam 1 & 2 are sold together in Pajama Sam Vol. 1 while Pajama Sam 3 is sold in Pajama Sam Vol. 2

Some more finds! Google Play links below.

Banner Saga
Banner Saga 2
Waking Mars
SimplePlanes
Surgeon Simulator
Oh...Sir!! The Insult Simulator
RollerCoaster Tycoon Classic (not sure if this is just a collection of RollerCoaster Tycoon 1 & 2 or is a combined remake of those games. Some of the expansion packs appear to be available as in-app purchases.)

Tempest:

https://play.google.com/store/apps/details?id=com.herocraft.game.tempest

Currently in open beta on android.

Planescape: Torment

https://play.google.com/store/apps/details?id=com.beamdog.pstee&hl=en