PetraVis (previously called Steinkraft) is a game that places the player into a world made of unit sized cubes. Cubes can be removed and new cubes can be placed nearby other cubes (block extrusion). New worlds can be generated and are automatically saved. It is inspired by BlockWorld and Minebuilder. Two other great games by hobbyist developers like me. Check them out!
NOTE: Loading worlds is deactivated in the LITE version. You can load worlds saved with the LITE version when installing the full paid version (PetraVis) on the same device.