It's on the game page:
Controls:
Movement Keys ( A | D )
Restart Game ( R )
Character Swap ( 1 for Warrior | 2 for Climber | 3 for Miner )
Warrior Throw ( Left Click and drag when near other character )
Climber Rope ( Hold Left Click to lower and raise rope )
Miner Pick ( Left Click when near rock wall to destroy )