Pretty addictive, can't wait to have more content. I know this is work-in-progress but here are some improvement ideas / issues that I bumped into it (which are not already mentioned):
Left click outside of the info window should close the window.
When an info window is open, I can click "behind" it. e.g. can open other info window unintentionally (could happen easily when zoomed out).
Catapult: "Need a second peon to operate the pipe" -> "a second" should be replaced by "an additional" or something as there could have already been 2 peons already.
Zoom with mouse scroll should be disabled if the mouse cursor is in the info window.
After a while, peons stop working and dragging them manually doesn't help. I have to exit and continue.