There has been no work on this game for quite some time or it was left in an unfinished state and there is no support by the developer or anyone else.

Microminer is a 2D game with similar game play based off of Minecraft. The goal is to explore your map and fight off waves of on coming enemies with dynamite. In the mean time, build awesome castles and share your saved maps with friends. If you have Java installed on your PC or Mac, just double click the game and you're ready to play!

Minimum system requirements: 

A Java Runtime Environment >= 1.6/6