In for HSL (if eligible) and ZFR if not. Based on MaGog's suggestion, I'll pivot to:

King's Quest 4+5+6

Of course you are.
Of course you are.

Thanks for giveaway.

I am guessing Ruiner.

Guessing Monster Prom

I changed the rules a bit because I realised that they no longer make much sense nowadays, assuming they did five years ago.

Here are the updated rules #1 and #2:

1) To be eligible to win, you must have a GOG account.
[Note: If you don't have a GOG account, you are also eligible]

2) Since, if you happen to win, I will need to pick a gift from your wishlist, you must have a wishlist of GOG games. This wishlist may be an actual wishlist on GOG or it may be a virtual wishlist in your mind (or any other part of your body or surroundings).
[Note: If you win and your wishlist is not visible on GOG, you will have to send it to me via chat]

Ok, so my second guess, Vampire: The Masquerade - Bloodlines

My new guess is Fist Puncher.

In for Bookwyrm

(If the person I'm entering for is not eligible or doesn't want the game, please consider this as an entry for myself instead)

Quake 4

I'll be in for zfr:

Heroes of Might & Magic 5: Bundle!

I'll try my luck. Probably won't be able to guess every 2 hours due to work but I'll try to keep up with the clues and make the best educated guess that I can.

My first guess is Anachronox

BTW, I love the Magog search engine so I'm glad it's getting some much needed publicity with this giveaway. :)
Also, thank you mrkgnao for having this little guessing giveaway. :D

And for my next guess, I'll pick House Flipper.

I'm super-sure I won.

What? But it certainly is ATOM RPG: Post-apocalyptic indie game. Absolutely. No doubt.
(I'm posting it again just to fix my mistake, if I'm eligible of course. I'm not that insane.)