W, A, S, D to move
Space, shift to fly up and down
Mouse to look around
P to change controlling object
I, K, J, L to move controlling object.
U, O to move controlling object up and down
B, N, M to rotate controlling object around the X, Y, Z world axis
G to toggle gravity for grass block
F to reset grass block position and velocity
What orange portal is showing (what blue camera is seeing):
What blue portal is showing (what orange camera is seeing):