Forward: W Backward: S Turn right: D Turn left: A I knows it lags a bit! You can walk through walls :P I can't make it more complicated because it will lags more.
It is very easy to make remixes with an other map, it is just to draw a new costium to the map in the corner. I came up with this idea just with my own brain! (and "Realtime 3D Raycaster Demo": http://scratch.mit.edu/projects/1135568/ ) -Update 11.05.18- *Improved but still horrible