So, after playing the map: (I do know this is just a test for now, but here is my input)
Overall, the map textures and locations were great! However, the earth region and ice region were a bit funny. The earth region was covered in holes (that didn't go anywhere, mind you) and was difficult to travel through. This may have been your intention; however, having tons of random holes (to me) doesn't seem like the way to do it. Maybe instead add tall, crystalline spikes or something of that nature.
As for the ice region, my only fault with it is that there a are a bunch of random and tiny ridges everywhere. These IMO looked awkward and out-of-place.
Next, I would say that when you add more villages/huts, make sure that you fill them with loot! As there are no accessible caves around, it is incredibly hard to find useful resources like iron without digging a whole lot, and IMO digging randomly is no fun whatsoever.
Other than that, great work!
Oh, one other issue: when I fought Kulta, I had the mask of Stone on. After the battle, I looked, and lo and behold, the mask had disappeared and I was left with what was termed 'slag'. Is that supposed to happen? (i.e. Was that your coding or just Minecraft 1.9?)