Generally pretty good but your lack of specific knowledge showed a bit. Also there were a few important 'strategic actions' missed but as you said it was more a focus on the units.
I may as well say a few specific things...
About the factory choice, Glaive is actually faster than Scorcher. Cloakybots are the best Bot factory for large flat areas; most of their weapons are direct fire and they are in general faster. Another thing is that a Rocko Warrior army won't take a ridiculous amount of time to cross comet.
Scorchers (and other heatrays) do almost 0 damage at max range and massive damage at close range, this is pretty important for them.
'Raider' is was renamed years to Ravager ago with the purpose of fixing the confusion caused by an Assault Tank called Raider.
Bots aren't in general just worse than Vehicles, when I killed KR's army I would say the cause was how much more I had spent on mine.
Prec bomber isn't completely unbeatable ;D. I had a few turrets that kill them in one volley and take about 12 seconds to reload.
You missed a few things, with a bit of an unfamiliar game and multiple things occurring at once I don't really blame you but here they are as far as I can tell.
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The production of my fusion
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When KR got air
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KR's comm dying
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I did that super fast startdust building thing with the nearby HLT as well ;D
One thing about comet and fusions. I have played comet quite a bit and have noticed an interesting feature: There is A Lot of metal. So much that often your energy economy limits you more than your territory if you're not careful. I don't think you're really playing comet until you've got a fusion up. If you watched KR's bar he excessed a lot of metal while we both held about 1/3 of the map each.
I cloaked the fusion because I was pretty sure KR had not seen it and I knew he had a lot of bombers, losing your fusion on comet is bad. (Not building one in the first place is bad too).