Sorry for problems, I did mistake with UI and it do not scale properly! That could give you feeling there is something below, but there is not :D
I was in rush and didn't do any explanation inside game, sorry for the problem. You can enter build mode by just pressing 1,2,3 or 4 on keyboard. I did add extra explanation in game description, after jam will update game to make it properly.
I did a lot research with 3D graphic and I like this result, initially I thought it will work much worse in browser :D It was really good project for prototype and learning.
It's cool you still reach to play until 10k minerals :D
Thank you for playing and feedback!