How does the Risky Strats pathfinding work?

Thanks for reading! If you have played Risky Strats, you knows that it's extremely fun. Although the gameplay is simple, I feel like the scripting may be difficult for the movement of units. I know how to move the units and keep values, but i don't exactly understand how the pathfinding works. I am not asking for how the developers did it, I am only asking for any ideas on how to recreate it. Thanks :)