Interesting idea! Very ambitious to make and RTS for a short jam. The music was good. The background art was great.
Could use some instructions, though. It didn't take that long to figure out how the gold and coal resources worked, but no idea how much the soldiers cost, and how to use them. I could select them by dragging the mouse, but didn't find any way to attack.
Also, don't know why you would recruit builders since the buildings seem to build themselves in a few seconds.
There wasn't much indication which one of my buildings was attacked. My buildings seem to be in "turn-based" mode, too, since they would give out resources in chunks rather than over time, and they would stay at 0% health for a while before destructing.
Bugs: Right-clicking gave "null reference" errors. The music didn't loop. After restarting I could no longer move around the map.