Video games are like having your time with screen space just like watching tv or working with a computer. It is one other form of or to be kept as small time timepass or entertainment. No research to my knowledge says that it will work for depression
or to have a positive mindset. Rather there are adverse effects only as results proven by research due to long time usage of video games. It shrinks your thinking, increases immediate gratification, further increases addiction stimulating the craving center of the brain. If you are in depression anergia will be one among the symptom and if you play video games you will be doing nothing other than restricted to the game without any fruitful work or any learning. By winning a target r a game you might get a satisfaction and momentary happiness which gives a falsified image compared to in real life you will be bugged and bored as winning needs lots of hardworking and motivation. Take up some outdoor games, feel the fresh air, sweat,exercise and keep urself healthy. Take care.