Rockfall - The Return
This game puts you into the boots of this little treasure-seeking fellow who goes by the name of Spud. His goal in life is to collect as many gems as possible in order to secure a nice little retirement fund for himself and his family. On his quest he has to tunnel underground and collect all of the gems he can find. The only problem is that he is hindered by the ever-present risks of falling boulders, various nasties and other hazards.
The license of this software is Free Trial Software, the price is $16.00, you can free download and get a free trial.