Hello! This is such a cool idea for a mod! I'm using it now to play with my new-player-wife. A suggestion is that you hide your own indicators from yourself. For example, with two players I will only ever see indicators from the other player.
Don't mind if this is a setting. Or maybe I missed the setting? :)
If I can make another suggestion. The selection marker is currently a dot, which is quite obstrusive. Would be awesome if it looked like the actual selection marker, like only showing the corners. I guess this is a little more work though :)