I couldn't place more than one object; after that, when I pressed space it acted like I was pressing the ui buttons instead.
The game looks really nice though, and from what I've been hearing in this comments section, you put a lot of work into it.
Ah I completely forgot! Weird that you ran into it, hadn't heard anyone else with thay issue, but godot did that to me one time and I forgot to turn it off!
Sorry you didn't get to play more, glad you liked the look though! :)