The controller works, at least with the keyboard. It will throw an exception if
it can't find one though so if you don't have one then you can't player the game or
comment out the player part.

Anyway, there is also acceleration and decellartion controlled by the
player class since that is where the kart rotations are being done. It makes the
kart speed up to a max speed and grcefully glide to a stop if you
let your foot of the gas/reverse