I notice that shooters enganged hand-to-hand with melee opposing units can, on their turn, retreat one tile back and then shoot to the enemy. I find this a little weird. Shooters should have some form of disadvantage when engaged to melee units. This can be fixed in many ways, the easiest possibly being to penalize shooters when they move and shoot in the same turn. Others: free attack on retreting units, cannot move and shoot in same turn, cannot disengage...