I've just uploaded a new demo update with a few small improvements:
No need to hold SHIFT to place multiple buildings.
The Forge can now produce Iron and Magic without Water, but at 50% efficiency.
Added hotkeys (1-8, E, T) for quick access to the global buttons in the bottom-left corner of the screen.
I also haven't introduced two biomes yet:
Dark Biome
Units can receive a temporary +50% damage buff.
Units may become cursed and lose a small percentage of health. Build Wells and research Well upgrades to restore their health.
Trees can randomly drop bonus resources when cut down.
Cutting down trees has a small chance to spawn enemies, so make sure you have defenses nearby.
Snow Biome
Cold weather slowly repairs burning buildings, giving defenders an advantage.
Combat units move slower, making defensive strategies more effective. Workers are unaffected.
Some buildings operate less efficiently, such as Wheat , Water Wheels, and Wells.
Forges provide warmth, allowing nearby buildings to operate normally.
Thanks for playing! If you have any questions or feedback, I'd be happy to hear them.