Glad you like it.
If you need increased resolution of an area without increasing the size of the map, try to modify the canvas->zoom,west,north parameters.
I might make some changes every once in a while, so if you want to retain the exact version I have out now, feel free to download it and run it locally. It's javascript, so just open the downloaded webpage in a browser.

The next time I have a long stretch of free time available, I would love to expand the generator: calculating stable wind and ocean currents, rainfall and rivers, and finally from a few colonies spreading cities and nations, with culture vectors and relationships (using the ocean currents for transportation, of course) that may conquer and expand and... well... I might be in over my head