ARROWS to move.
WASD to use tools.
Q and E to switch tools.
Mining rock gives you nothing. Go for the gold!
Tools, in order:
MINING PICKS allow you to mine. They also do moderate damage to enemies, and remind medics to heal you.
WALLS cost gold, but can be used to block off entryways and seal a room from enemies? Or force the enemies into coming in single-file to be slaughtered.
FLOORS cost gold, and look nice. They can also be used mark which way you came from.
CANNONS will deliver HEART-SHATTERING DAMAGE in the direction that they are aimed if they have a clear shot at an enemy. If you?re in their line of sight, they won?t shoot you! They also won?t needlessly shoot if there aren?t any enemies around.