This is so good. I've played the demo almost every day to destress. I get so into it that the little bummer sound effect when I hit the tile limit surprises me every time! Three quick suggestions if you haven't thought of them already:
- mountain and/or hill tiles
- snow biome
- biome transitions on the map (if it doesn't already exist - there're not enough tiles in the demo to try it)
I'm anxiously awaiting the early access release so I can play more tiles!