I started up a new Excel-file this year for all the stuff I play and read, mainly so I can overview all the manga I follow. But it's also pretty helpful with video games, adding short comments and other stuff. Wouldn't remember half of 'em by the time December comes around otherwise.
And although I've not completed it yet, my GOTY will probably be TitS SC as well. Rocket League, Bloodborne and Monster Hunter 4 Ultimate are close contenders. Haven't played enough of Xenoblade Chronicles X yet, but that may end up in the Top-5 as well. Never found the time to start Steins;Gate sadly, would have been had potential for it as well.