I saw that in one of your newer maps, it is possible for the player to go from lv 39 to lv 44 by going through a town, as shown here http://prntscr.com/c1bp0b
If you do continue in this fashion, I would suggest a blocking access to the town from the lower of the connecting nodes so that the player wouldn't be able to do this. That means the town would be the reward for travelling through the lv 44 region rather than the lv 39 one.