Dota 2 - I haven't been able to play dota for a long time but I used to be very addicted to it, maybe I just quit because I was too busy and couldn't play anymore.

LoveBeat - this one is rhythm game, it's fun to play especially if you like rhythm games. I recommend it if you like that. I also got a girlfriend here and we are still together.

Farlight 84 - this is a new game on steam but for me it is beautiful and entertaining to play.

Those are online games but they are free to play, try them.