W,A,S,D - Move around
Q,E - Pan left/right
R,F - Look up/down
Mouse - Look around
Left Click - Place gravel
Right Click - Remove block
FPS: --
Performance is not perfect, however, the special thing about this project is that a ray cast is being used to idenfity which cube you are looking at, which I had a hard time optimzing. I am getting 9-10 fps in Firefox on macOS.