OK, let us try round 2, then.

We shall use GOGDB's database from
www.gogdb.org/backups_v2/csv/2019-02/

Get the latest dump, unzip it and open the file called "products.csv" on an spreadsheet.
You select all data, sort on "store date" and check the release date of the games next to it.

There are many ways to filter this information so that you will see only the games you care about. But this is simple and gives you the information you are looking for.
For 2018 I can list the following 51 games released prior to 2013, from the oldest to the most recent:

Dragon's Lair Trilogy
Maniac Mansion
Drakkhen
Spellcasting 1+2+3
Eric the Unready
Death Gate
Shivers
Mission Critical
Lighthouse: The Dark Being
The Dame Was Loaded
Fallen Haven
Close Combat 2: A Bridge Too Far
The Curse of Monkey Island™
Fallen Haven: Liberation Day
Close Combat 4: The Battle of the Bulge
Close Combat 3: The Russian Front
STAR WARS™ Episode I: Racer
Close Combat 5: Invasion: Normandy - Utah Beach to Cherbourg
Metal Fatigue
Wizards & Warriors
Escape from Monkey Island™
Carmageddon TDR 2000
Myst III: Exile
The Mystery of the Druids
Myst IV: Revelation
Call of Cthulhu: Dark Corners of the Earth
Close Combat: Modern Tactics
LEGO® Indiana Jones™: The Original Adventures
Overlord II
LEGO® Indiana Jones™ 2: The Adventure Continues
15 Days
Panzer Corps
Mafia II: Director’s Cut
The Tiny Bang Story
LEGO® Pirates of the Caribbean: The Video Game
Close Combat: Cross of Iron
Enigmatis: The Ghosts of Maple Creek
King Arthur II: The Role-Playing Wargame + Dead Legions
Hegemony Gold: Wars of Ancient Greece
Nightmares from the Deep: The Cursed Heart
Cinders
Panzer Corps: Afrika Korps
Close Combat: Panthers in the Fog
Kenshi
Panzer Corps: Allied Corps
Nightmares from the Deep 2: The Siren's Call
fault - milestone one
The Bureau: XCOM® Declassified™
Enigmatis 2: The Mists of Ravenwood
Cook, Serve, Delicious Original Soundtrack
Cook, Serve, Delicious!

"Look, there's the pub!"