I would like to point out that I checked alot of them all the free games, don't even need a code to get. So no need to bother taking up the managers time by asking for any of those titles. And even if they ended up costing money latter, you can officially add it to your library using the purchase system (which is strange) so it's still free just as if you used a code.
I would like to especially point out Beneath a Steel Sky, a very interesting looking point and click adventure game. It has a good rating on Gog and speaks of NPCs moving about on their own as if they had their own lives, intriguing.
Well, he specifically mentioned the games that are also available for free, so everyone can decide for himself. Honestly I would just remove them from the list or just post a link to the shop site, but that's not up to me.
BaSS is a very good adventure indeed. The NPCs who follow a routine instead of standind still in one place are not really a new invention of this game, but it added more of them. But they are far from having "their own lives", they just follow a repeating routine.
If something like that that appeals to you, you really should play Gabriel Knight: Blood of the Sacred, Blood of the damned.
Some NPC do certain things only at special times - ONCE. So you CAN (and will - on your first playthrough) miss a lot of opportunities, nothing game breaking however. You can miss a phone call, not get finger prints, not meet someone in the lounge. not get certain dialog options. If you miss a lot of evidence, you will make quite a fool of yourself when it comes to the Agatha Christie meeting before the finale.
edit: Also take a look at Resonance. You often have the choice what to do next and depending on that choice you might miss some scenes, because your previous action took to long.