So I just played a really fun game. First time I won with Zemora, even though I'm sure I played suboptimally. Really close and it came down to some really tricky defensive tactics. Any thoughts on how to improve?
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The Blastforge into Flame Animus is a little questionable: you will want to build a lot of Tarsiers, and against an opponent who is trying to build this much economy, you'd like to apply pressure quickly, and a real Animus lets you get more Tarsiers sooner. You'd have to cut a drone, though, so the Flame Animus seems okay. The turn after that, though, I don't like building two drones
or an Electrovore. I'd cut the drones for an Animus: three Tarsiers per turn is a lot of pressure for just a little money, and your economy is already pretty big; you just need to do short-term things now to help you survive until Zemora arrives, not invest in more gold income.
I'd also switch the Electrovore for a Tarsier: your opponent can get rid of all your Engineers in a big hurry if he wants to, and the Tarsier will deal damage. On the other hand, you did well to just accept this by defending with your Electrovore immediately, so maybe you got a great bargain by building a 4R Rhino.
On turn 9, I don't like the Forcefield. Just build a Barrier, and be prepared to sacrifice a Steelsplitter in the unlikely event your opponent attacks with everything. When you Forcefield, you commit to losing the Drone regardless, while your opponent gets to keep some units back on defense.
On turn 10, the second Animus is very bad: are you really hoping to spend over $20 on red in a single turn? There aren't even five Tarsiers left in the supply. Cut it for a Gauss Cannon or something, and put up a Barrier as well just to increase your defensive flexibility. As it happens, when he attacks for max the Barrier will go unused, but that's not a big deal: you will be wrecking him quite soon, and can afford an insurance policy as cheap as 1G.
On turn 11, you overdefended by one, because he can't possibly keep enough Engineers to fire all his Electrovores, even if he sacs the Wall instead of absorbing. Cut a Forcefield and replace it with Barrier.
None of these mistakes really cost you anything, because your opponent had a very bad plan: you can't just drone up against Zemora, you have to apply pressure to win before Zemora can save the day, or sometimes you can do okay getting your own Zemora. Overall I would say the mistake you made the most often was underutilizing Barrier: you have a giant pile of green available, which means that Barrier's cost is practically just a single gold. Often, you built a Forcefield when a Barrier would do; even two Barriers only costs one more gold than a Forcefield, while saving you a Drone and adding defensive flexibility.