Good for a beginner. Not going to C&C but just a few tips if you decide to do more maps.
Try and vary up the objects a bit and don't use an excessive amount.
No real entrance/exit area unless you have a hidden warp. Unless hidden it should be something simple like a hole in the wall or a different colored tile.
Bottom and right walls don't really fit the map image but in regards to your concept they would.
I might release maps during my winter break but at the moment I am unsure if I will have the time.
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Former multi-server mapper.