It's the color palette, but I'm working on an alternative palette which is more saturated. Right now you could use Krita to change the colors by playing around with "Filter > Adjust > Burn" and "Filter > Adjust > HSV Adjustment".
Viewing post in Isle of Lore 2: Hex Tiles comments
No update yet, as I want to redraw everything with saturated colors and in a higher resolution instead of just color correcting them! Sorry! :(
You could put together a map and saturate it by yourself in the meantime; if you have problems with graphics software like Krita or Photoshop, I'm happy to help! :)