Help analyzing where I go wrong please? (Reply attached)

I know that my micro needs some work as I'm only sitting around 50APM but overall I feel like I've got a decent hang of things. Yet I've been pounded repeatedly in this match-up and the computer isn't even on insane so I know I must be missing something. Any (constructive) criticism is appreciated. Thanks

 

In the first engagement it would have been good if you had some speedlings left to eat away at theire units while they were trying to retreat.
You lost the fight when they wiped out all your lings while your roaches were far behind. What you want is to have the roaches infront to absorb the damage and then come in from the flank (if possible) with lings or banelings.
I would also have liked to see the mineral line fully saturated earlier, 5:30 is a bit late.
When in a fight you cant win try to retreat and gather your forces and engage when you have the upper hand.

Basically keep your army together better, make sure you use the right unit for the right role, attack when at an advantage, leave no survivors

 

I know its a little late but I just wanted to say thanks. I finally got the chance to play again yesterday and gave that a shot. I upgraded my speed sooner and kept my units closer to base until I had a chance to spread my creep. I still feel like I'm focusing a little too much on units and not enough or econ but at the same time, it worked. In exchange, I've just slowed down my teching which, unless you scout a guy going air, then there isn't a problem and if you scout, well there isn't a problem either anyway, thanks.