@tzenes: His attack at 12:43: The effect of his Banelings has been minimized by the Marauders (he got the Marauders down but it would've been better against Marines), the Zerglings got weaker before they managed to get to the Marines and so he had to retreat and wasn't able to take out the Marines + Medivac, Factories and Teched Rax.

Tarson didn't properly use his Marauders and neither has created a Tank which allowed Zerg to be able to harass the minerals that way. Tarson didn't know the Banelings were coming, his Banshee scout failed and neither did he have map control... If he did, the Banelings were moot.