From about minute 7 you have no mass, but power. had you even one engie reclaiming then it would have helped and you'd have more units since you had factories making units which needed mass...
Also near the beginning you bomb his base, he gets AA - best thing to do is bomb somewhere else
One more thing I noticed, you had t2 engies up before him, and built TMD... Why not TML too?
It's hard to think more offensively but he had no defence (he also had no launchers) so you could have taken out most of his t2 mexes.
(I say this all humbly, I'm terrible at micro and its always easier to see others mistakes!)