This retroish arcade game puts you in a randomly generated cavern full of colorful ore as a mining robot, whose task is to mine randomly-generated caverns of their ore.
Controls can be found in the tutorial (which I highly recommend going through to understand the gameplay), but here's a brief list of single-player controls:
Arrow keys move the Minerbot.
Enter or F fire "collectors," devices that attach to ore veins and collect the ore within.
Minerbot was originally created under the name "A Greedy Profession" for a Mini Ludum Dare competition. It was very confusing back then. It still is a little confusing now, to some--but it has come a long way.