Thanks! Unfortunately I wasn’t able to get it to work. I am using a Mac; I’m not sure if that’s the problem. It responds to my clicking, but it doesn’t seem to actually select the item. Like, when I click the button, it highlights the item, but when I release the click, the item is no longer selected. No matter whether I’m holding space or not, I don’t seem to be able to interact with the white circles. Sorry, but the game looks great and interesting how many options there are for building.