I don't like to give your demos poor ratings Jay but we've got alot of Show Down games that are 10 times more competitive than this.
You could have ended this game a hell of alot sooner if you'd wanted to. You build 3 HLT's before you build a single Guardian. And you place the Guardian really far back. You should be going straight to Guardian with MT creep and you would have broken the opponent in a matter of minutes.
Instead you sit back and porc, tech up to bertha and finish him off. But it makes for dull watching when you know the opponent isn't savvy enough to retaliate, or build contingencies for the predicatable attacks.