The first example mission should be a simplified version of the final battle in Tenet:
the protagonist
army of marines
army of zerglings
one holy item which is protected by the zerglings
the quest is to get an switch an item protected by the zerglings (similar to the artifact)
the protagonist as to invert himself at one point to move the item to a certain point when it is not protected due to the attack which goes forward and moves the zerglings away from it.
some zerglings will invert themselfes as well trying to protect the item from being switched
then he has to go forward again and pick it up, bring it to some point and complete the mission
reasons for failing the misssion:
runs out of time
the zerglings kill the protagonist in one of the time directions
After finishing the mission you have the knowledge how it works to make it easier.
This is different from the movie where you cant change things.
So you can go back as many times as you want into the exact mission and collect bonuses or help your protagonist in a different way.
A better predefined path of the inverted warriors. They should already have fought for the Algorithm (against inverted Hydralisks).
If it is more like in the movie, the missions should be seeing yourself doing stuff inverted and doing the same in time or failing! Maybe construct such scenarios.
The inverted units should do something in the past after something happened! For example, a bomb goes down and kills almost all of your units, you can always reverse the time and prevent it.
Both forces should have access to inverting the time but there should be some limit on how often and fast the time can be inverted, maybe some gold cost.
Both teams (blue and red) will have to wait on the specific time direction.
The first example mission should be a simplified version of the final battle in Tenet:
the protagonist
army of marines
army of zerglings
one holy item which is protected by the zerglings
the quest is to get an switch an item protected by the zerglings (similar to the artifact)
the protagonist as to invert himself at one point to move the item to a certain point when it is not protected due to the attack which goes forward and moves the zerglings away from it.
some zerglings will invert themselfes as well trying to protect the item from being switched
then he has to go forward again and pick it up, bring it to some point and complete the mission
reasons for failing the misssion:
After finishing the mission you have the knowledge how it works to make it easier. This is different from the movie where you cant change things. So you can go back as many times as you want into the exact mission and collect bonuses or help your protagonist in a different way.