This is great software with a number of uses. You can use your own art too. This cuts out A TON OF WORK in Photoshop!
I have one request to see if this is something you want to do:
1) This one is probably a bit difficult to program....I work a lot with 16x16 and 32x32 art. The current art is blurry and unusable when scaled down. So if there was another script you can add that will replace every pixel with a square of the approximated color (repixelize it so it isn't blurry) that would be really cool.
Edit: I found out how to export as transparent PNG. Great feature!
Those 2 would make this the perfect software, something I've been looking for years. Still worth a purchase now for all the randomized textures, terrain, ect. Good work man