Well, I bought this game aware of the bugs I might find, but from what I've seen, its nothing too bad, and quite an interesting game! I then found a bug the day I bought it. It's actually kind of funny, yet frustrating. Why is this person perpetually creating a tile? Here are a few images in an animation-like fashion.
Steps to Reproduce
Create a high ladder, and one space left from the top create a tile, which is accessible to a duplicant. Be prepared for hilarity or disappointment. Moving the duplicant or canceling construction doesn't fix this.
This issue has been fixed in either a future version or updated in a previous version.