player 1: (left) raise cannon: "w" lower cannon "s" forwards "d" backwards "a" gravel "q" shell "e" big boomer "r" drill "f" player 2 : (right) raise cannon: "o" lower cannon "l" forwards "k" backwards ";" gravel "i" shell "p" big boomer "[" drill '
thanks to @skywalker858347 for some key detection, and @knexboy (me) for everything else.
