Oh god thank you.
I keep making cool stuff then i realize "fuck I can't save"
Wait, this is really buggy.
I saved a version of something I was making (this was pre-liminary so I'm not losing anything major here), then hit play. It didn't work the way I liked so I stopped it and opened the file to go back. It loaded up but, even though the game said I was paused, it started running, so I figured I would just start again. I hit new and it loaded a completely blank area and none of the boundaries were made, nor was the ground. I could still build stuff though.
Also when I click open, if the drop-down menu is set to ".buildism", it won't recognize any files. So I have to select all files. If you're confused by that, here: