Hey giraffe, feel free to send me some friendlies if you want to practice some more.
I took a look at your game and saw a few issues that I feel could help you a lot. I hope you don't mind if I post my thoughts here. I am hoping that it might help some people, and also I'm hoping that the players better than myself can chime in with their input as well.
The first thing is this
You usually want to avoid attacking spawns, especially vs feedback. There are times where you might want to attack a spawn, like if you want to stomp it and take the spawn away from them. You might want to sometimes send a small force down to the spawn or maybe just a runner while you are attacking elsewhere. It really depends on the map and your strategy. Generally speaking though, you want to attack the side without the spawn on it.
Next is this,
On this turn, you basically knew where everything was and what she had. You need to find the biggest threats and eliminate them.
I circled the biggest threats (in my opinion) red.
I circled the heavy orange because it felt less important to me. It's both cheap and easy to get rid of the 1 hp heavy and it is threatening your base. The soldiers could take your spawn and kill your soldier and sniper unless you do something about that, and it's usually a good idea to take out scramblers when you can.
The sniper and soldier are yellow because they aren't a threat at the moment but you need to remember they are there and consider them when placing your units.
I would have went with something like this.
Kill the 1 hp heavy with a new runner.
Kill the scrambler with the soldier.
Pull the soldier back to protect mobi.
Kill soldier with sniper and soldier.
I didn't look super carefully so there may be a better move, but this takes care of the most dangerous threats. Her heavy could still kill your soldier or she could use soldier and heavy to kill your 4 hp soldier but that's all she can really kill the next turn. 1 soldier. If she does she will then lose her heavy.
One final note, it would have been better to bring your runner back on turn 4 than it was to move the mobi.
I'll delete this if you don't want it up here, but I was just hoping it helps. It's really easy to do what I did and see everything then know what to do, it's hard being in the game trying to keep track of units in your mind. Trying to count wits. You are doing well! I am sure you will win at least once in the tourney.