At first glance, I saw that we had quite a bit of spirit ore stocked up, which meant I could build a ton of stuff. However, when I accessed the tech tree, I saw that there were many more options that I needed to take note of.
First, I had about ten worker type Steel Golems, which were harvesting, and I could build more. The workers were termed engineers, which made it easy to remember. Apparently, the optimal number was twenty-four, so I queued them up. I noticed that I could also build a refinery over the gas vents to collect spiritual gas, which, I needed for higher-tech units.