One approach I like for these encounter / battle scenes is to set it up to turn off all the rest of the game, load the battle scene.
For iteration 1, the battle scene might just have a single button: COMBAT FINISHED
Get that flowing perfectly, back and forth between the modes.
For iteration 2, the battle screen might list the parties involved and ask you to checkmark who lives and then press “combat finished” button.
Get that going, have the parties get weeded out by battle damage, etc.
This would be a good time to detect end of game, or offer resurrection abilities.
At that stage you have built an ultra-flexible framework where you can start iterating more things within both the inner battle scene and the outer world.
And of course, ALWAYS use proper industrial-grade source control in order to guard and protect your hard-earned work. That way if you break something you got going early on, click-click-click it’s instantly and perfectly repaired, no muss, no fuss.
Personally I use git (completely outside of Unity) because it is free and there are tons of tutorials out there to help you set it up as well as free places to host your repo (BitBucket, Github, Gitlab, etc.).
You can also push git repositories to other drives: thumb drives, USB drives, network drives, etc., effectively putting a complete copy of the repository there.
As far as configuring Unity to play nice with git, keep this in mind:
https://discussions.unity.com/t/736093/3
Here’s how I use git in one of my games, Jetpack Kurt:
https://discussions.unity.com/t/807568/3
Using fine-grained source control as you work to refine your engineering:
https://discussions.unity.com/t/826718/2
Share/Sharing source code between projects:
https://discussions.unity.com/t/719810/2
Setting up an appropriate .gitignore file for Unity3D:
https://discussions.unity.com/t/834885/5
Generally setting Unity up (includes above .gitignore concepts):
https://thoughtbot.com/blog/how-to-git-with-unity
It is only simple economics that you must expend as much effort into backing it up as you feel the work is worth in the first place.
“Use source control or you will be really sad sooner or later.” - StarManta on the Unity3D forum boards