Build and manage a colony, use automation, transport systems and explore different islands in Kubifaktorium. [Demo] · By Kubifaktorium
Hah, might be something stuck inside. Thanks for reporting the bug. :)
It is not stuck.
It is most likely people and/or animals.
Try designate a tile in the middle to be mined, and you will see people go in there and mine!
Interesting, I'll have a look :D