Help me spot the things I do wrong

Hello,
I own an 2 player games flash games site (http://www.2playersonlinegames.com/) since approximately 3 years ago. It grew naturally for a while and after about an year it got on first page bringing some nice traffic and income.
After a few months it got hit by Google's updates and went from the 1st page to the 10th or worst. Since then it seems that every major Google algo changes bring the site even worse down.
For about a year now I was trying to bring it back to life with no success….
Help me spot the things I do wrong

See original post by PunctRo