Those are really good ideas!
- Resource "Checkpoints"
- Bigger building
- Buildings with "Special Abilities".
Adding to the idea list, will definitely consider this.
As for the protecting from fires, I first planned to add a fountain building that prevents fires from catching to the nearby tiles. It's tricky to balance because having to take care of the fires is a big part of the game. Maybe on bigger maps it would feel less OP.
Thanks