That was surprisingly engaging! I'm not usually a big player of RTS games, but I enjoyed this. I'd have liked a little more feedback while placing refineries (often couldn't tell where I could or could not place them, or whether or not they'd do anything useful when I did place them there - I ended up with a couple harvesters just sitting around, maybe one was stuck, one was just slightly too far from ore, maybe?). The tech tree felt very fleshed out, that's a lot of buildings and units!