I managed to do it, it took a bit toooo long for me to figure out how the mechanics work, but yeah I get the general idea of this.
I wish there were more maps to map and some external gameplay enhancer to making the maps. For example, a thunderstorm or fog making it hard to see parts of the map or having limited markers so you need to figure out what the best route to chart the area would be.
Another possible idea is that men will traverse the map after you finish making it, and you'd need to be smart about making them not adventure through treacherous areas otherwise they'd risk and inevitably die.
This game has potential to be an interesting puzzle game! You could also take it in the direction of a simulator if that's more your style, and just make so you can mess around with the different features of map making. Good work, keep making games!