Hi, this looks like a fun game! Just to make sure I am understanding, if 2 enemies are in the same space, then they cannot be attacked with a Range zero weapon?
Range 0 means same space can be targeted, so 2 enemies (player and not-player) can fight each-other with Range 0 attacks. If 2 enemies are in the same space but the player is in another, then only a Range 1 attack would work.