I also needed some time to understand that I needed to select lines twice in order to fix them. Not sure what inspecting them (the first action) does, other than change the color.
Unfortunately, I was never able to win the game because I ran out of time while thinking. Would be cool to have a difficulty setting for people like me who are not playing puzzle games often :)
I did like sending my dudes to do stuff though. Was very satisfying sending them around the map to do their thing, and also very satisfying to see big areas finally connected!