ID:268695
 
if a projectile hits the overlay, will it actually consider it the mob? Since when I seem to put my mouse over the mob's overlay, it seems to represent the mob...
An overlay is only a graphical extension of an object. Even if you offset the overlay with pixel_x/y to look like it is in another tile, the object is not treated as being there as well.
In response to Loduwijk
Overlays don't have density issues, nor opacity or whatnot.