Huh I think I broke the game. I accidentally clicked the move button for a Control node while I was trying to understand how to play, but I couldn't go back, so I clicked New wave to try to continue and it let it on a weird place. Now I I can't build anything because it says it blocks the path.
Edit: so I missed the text for the cancel button at the beginning I see, but the cancelling doesn't work, it just let the building where it is...