You made a couple of really nice shots!
I would say that your positioning in general is not very problematic, although a couple of times you seemed too far back when you were up at net, including one time when you were behind the service line in no-man's land. You are just going to be target practice for the opposing team there, unable to hit either a decent volley or a groundstroke from that position, while they can put balls at your feet all day long, or pass you down the alley, when you're standing that far back.
My advice would be to always ASSUME the next ball is coming to you, no matter where you are on the court, and move your feet to get ready to meet it. You looked glued to the ground a few times there, and if you had been expecting the ball to come to you, you might have anticipated a bit better and moved up to get some of those short balls.
One time your partner took your ball, and left his side of the court wide open, and you guys lost the point as a result. So maybe you could have yelled "Mine!" to him so he would have covered his own side? If you're going to move in on your partner's side of the court like he did, you'd better put that ball away for a winner! His court positioning troubled me more than yours.