There's nothing inherently wrong with playing video games, even IMO the "violent" ones (impurity being a separate issue). MOST people can tell the difference between fake violence (in movies and video games) vs. real violence. I for one would have no problem hacking things up with a chainsaw in a video game (though I really haven't played any video games in probably 20 years ... not interested anymore) ... but in real life I don't like even crushing bugs (but will throw them outside) and always use the humane mouse traps, etc. ... and especially find it difficult to see people suffering. It's usually the people who have no sense of morals that are influenced into violence by these games. Also, more and more, real-life war is conducted via drones or other unmanned vehicles, and you get footage all the time of "solders" controlling these drones remotely and blowing away innocent civilians, and often laughing about it ... thinking of it as if it were a video game. Now the US armed forces have armies of skilled gamers ready to control deadly drones to slaughter people, having become desensitized to it in video games.
Now, the problem is that if you are like some and go back to gaming, that, if you're liable to being addicted to it, soon you could find yourself wasting many hours a day where you could have been doing something more productive and more for God's glory. That's why alcoholics can never "just" have one drink. As soon as they take their first sip, they tend to fall off the wagon. Same thing is true of many gamers. If that's you, where you would not be able to limit yourself to just an hour or two per day, then it's probably not good for you to start back up.
You do want to avoid anything that might have certain occult elements in them, though I think a certain amount of fantasy "magic" per se is OK, provided it's not dark, or especially if you're fighting AGAINST various nefarious forces in your game.