I found a page that says it includes this:
House of 1000 Doors: Family Secrets
Eternal Journey
Dark Strokes: Sins of the Fathers
Weird Park: Broken Tune
Twisted Lands: Insomniac
House of 1000 Doors - The Palm of Zoroaster
Exorcist II
Behind the Reflection 1
Behind the Reflection 2
Mountain Crime: Requital
Vampire Saga: Hell Lock
Oddly Enough: Pied Piper
Epic Escape: Dark Seas
Exorcist 1
Kidnapped in the City
Mystery Cruise
Journey of Hope
Stray Souls: Dollhouse Story
Mind's Eye: Secrets of the Forgotten
Twisted Lands: Shadow Town
Vampire Saga: Pandora's Box
Soul Journey
Oddly, that adds up to 22 games, not 20, but maybe they slipped in a couple of extras.
That's nice that you are receiving it free of charge.