Checked it out. As I can see, you're at the very beginning of the development process, but I'm posting my suggestions here based on what I saw, anyway
Some advice on building the environment:
- When placing grass/flowers/mushrooms, maybe small rocks, use the 'group of objects' option in the editor. It allows you to place multiple pieces of the selected item onto the units (squares) of the map. It looks cool and gives the environment a more natural look. Use it with trees for forests, if you wish.
- Place a roof onto each house in settlements. If you go for a larger town/city, make multi-story buildings by placing wall blocks on the upper level. (side note: Two kinds of roofs are available in the editor. Use the ones in the 'roof (on a wall)' tab for houses, they must be placed on the first level (!) and use the ones in the 'lonely roof' tab in case they're supported by pillars, for instance. However, this type of roof must be placed on the second level.
- Apply decorations and try to leave few squares/walls blank on the map. I think they make the game a hundred times more enjoyable. I personally always use some cracks/reliefs on walls whenever I see there's a large blank surface in front of me.
As for the written part of the expansion:
- Capitalize the first letter of the sentences. Texts are highly important in RPG games, and dialogs/tables in all lowercase letters make them look like as if they were kind of neglected.
(p.e.: shopkeeper -> Shopkeeper)
- Use greetings for NPCs. There are pre-written ones in the base game, which can be accessed by clicking the 'Add shared' button below the 'Greetings' window. (not obligatory, they just add a lot to the game's atmosphere)
I think it would also be better to send the file to someone for testing before publishing it to avoid bugs and mistakes. But that's up to you.
Anyway, consider these small tips when you get back to building the map, I hope I could help.