Broken Sword: Director's Cut
 

If you don't have it already.
It's a good game, maybe the second was a bit better.

Greak: Memories of Azur
 

This thing actualy looks great.
I'm not rly into metroidvania, but sure looks promising.

Worms Revolution Gold Edition
 

I can't tell if there's much difference between two Worms-title, so one of the titles can be enough.
The story-mode has waaay to many levels to reach the end though if you ask me, at least in the game I played (which was not this one).

Daymare: 1998
 

Some kinda Resident Evil clone.
It might not be the real deal, but when it's free you can't really complaint just for that.

Haven Park
 

Dunno what's this new trend combining managerial with RPG, but maybe they create ok sandbox games.

Alien Breed Trilogy
 

Some kinda Aliens-wannabe, but given no gamplay video is attached to the store-page, can't decide what this is: somme TPS? tactical group-thing like X-com? Can't decide by the attached pictures. Marketing did not done a proper job with this one.
I suggest looking up gameplay on youtube before picking this uőp, even if it's free.

Biing!: Sex, Intrigue and Scalpels
 

I have no idea, seems like a managerial FMV-game, which teases you it could have been an arcade shooter (flying left to right in a tunnel).
Sounds like there's a joke somewhere, the main appeal can be it is GoG-exclusive.

Figment
 

Looks fine. Cheery, children-friendly.

Lorelai
 

It says "action", while looks like a very woman-oriented point&click game. Hm.