Great posts JBruu,
I didn't know you were into pc gaming. I am a huge fan of Killing floor and I am a regular Steam user. I have over 250 hours on Killing floor and I agree it is one of the very best zombie games out there and arguably the best zombie arena/survival game.
In the past 2 years I have gotten into PC gaming and recently console gaming (Ps3) and it's a blast. Not to say I don't appreciate mobile gaming because there are some gems, as JBRUU mentioned Heroes and Castles, which I would nominate for game of the year on iOS. For overall experience and immersiveness there is nothing like pc or console games. I recently finished The last of US which was an incredible gaming experience.
Mobile gaming is nothing to laugh at though. Playing games like the modern combat series and indie games are a blast to play on iOS and I look forward to more original games on mobile in the future.