This was a mixed bag in terms of design. All of the islands featured the same thing (which all in all weren't bad, but it seemed a bit repetitive.
In addition, the coastlines of a good number of the coastlines went straight across, with only a few 'natural' looking coasts. One of the islands really just looked like a block of sand with a bunch of trees dropped onto it.
Some sand-mixing would look good as well.
All-in-all, definitely not bad, but could use improvement. Mostly in terms of the coastline.
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