Underground Jam Entry - Sadly, it is not finished... Many art assets are still place holders, and there is no in game help or description of what you are supposed to do. This game was mostly done by my 14 year old son - with a little help from me on the tricky parts.
Use the arrow keys to drive your digger.
You must watch your gas and temperature gauges!
You will need to upgrade your digger before you can get very deep. (There are rumors there may be Underground Jam at the core of the planet). To buy items at the Upgrade Store, click on the price of the item.
Press the Space Bar twice while you are at the Gem Store to sell the current contents of your diggers inventory (the minerals you mine while you are under ground).