A/D = move | Space = jump | S = Crouch | Shift = Run | Click = add blocks | Right click = remove blocks | E = interact with block

Scroll wheel = switch blocks (firefox only) | left/right arrows = switch blocks | up/down arrows = Change zoom level | Ctrl = full window

If the game is blurry, it's because your browser (chrome, IE..) does not support CSS image rendering tag.