Issues with multiple layers and collision in 2D tiled map

Hi guys,

I'm currently working on a class project to create a 2d bomber-man-like game using Unity and I'm stuck at figuring out how to move my characters between layers while maintaining the integrity of the tiled map.

Using Tiled Map Editor, this is the 15-by-11 map I created:



And there are 14 layers in this map (11 layers for 11 rows and some others for miscs). So the order would be layer 1 is used to put on object on row 1 and so on for other layers/rows all the way down.

The concern I have right now is I don't know which layer to use to put my character on (assuming I have a layer of collision objects and I will put my character in there).

Say the character is at position (3,3) - row 3 - layer 3 (assuming origin is top-left), how is it possible for the character to [stay on top of/hide objects of] row 2, but is hidden by any object from row 4?
--> If I station my character in one layer then this will not produce a desired result when my character moves from row to row.
--> If I dynamically move my character between layers then the entire scenario will become quite complicated if I add move-able monsters onto the map and apply the same method?

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I'm using PopTag! as my reference right now btw.

http://nxcache.nexon.net/poptag/game/1pdemo.html




If this doesnt work out I might have to make the map completely 2D - 90 degree look down, or try with 3D and fix the camera angle to give the 2D feel.

What other options do I have? Could someone help?