Now with keyboard controls!

Oh man, I have working key controls for the player’s plane now. It actually goes quite cleanly into how the AI will control its planes as well, so that’s nice. A/D accelerate/decelerate the plane now, while W/S cause the plane to climb/drop. There’s upper and lower bounds on where the plane can go and how fast it can go (we’re staying a little realistic here!) but now I have to add other planets and hookshots. Maybe take a look at sounds or something like that. (Also all the other planes and resources!)