X: select skill to the right of currently selected skill (from climber to floater, bomber, blocker, builder, basher, miner, digger and back to climber)
Y: select skill to the left of currently selected skill (from climber to digger, miner, basher, builder, blocker, bomber, floater and back to climber)
A: activate skill, activate release rate signs
start: pause or unpause game