So this really is a very interesting map. Not perfect yet though.
I'm also a big fan of combining Sunken Ruins and Barrens, I think I made at least 3 maps with such combined tileset, even though it looks quite different on my maps. But I really like how it is done here.
Regarding gameplay:
-Getting lvl 2 from the merc camps alone looks kinda strong to me. Given that there seems be very little risk involved.
-At the shops, there is once again an issue with asymmetric itemdrops.
-The access to the 3-1-1 kobolds in front of the the base is too narrow.
-The central area: While I like it, it "feels" like there are too many ramps and/or narrow choke points.
-The rockgolem + double trapper spot should give an additional powerup. Or (one of) the trolls could be downgraded to lvl 2.
-The creeps at the corner expansions dont need to be on camp stance. It is highly unlikely that someone will go there without the intention of killing these creeps.
-Any reason why the "exit area" behind the arch on the west is blocked by pathing blockers, but not in corresponding area in the east?
So beside the asymmetric itemdrop, no other "bugs" to be found. Again, I trust you will fix this quickly. Therefore map approved.
For potential improvements regarding getting this map ladder-worthy, we can talk here or on discord if you want to.