There's definitely a hint of strategy game DNA in this design. The success chance was suggested by one of our devs who is a fan of Total War, and line-of-sight was just a cool effect I had wanted to add which also opens the door to other mechanics.
The island colours will change based on which faction owns that region, and for this effect I was actually inspired by contemporary maps, some of which are surprisingly colourful:
The island colours will change based on which faction owns that region, and for this effect I was actually inspired by contemporary maps, some of which are surprisingly colourful: