For me, a timer just starts, but no response to any key presses or mouse clicks. A refresh of the page does randomize the patterns but that's about it.
Thanks for giving it a try and commenting! Please try dragging a block of 2 or more connected tiles (same color) to the border of the gameboard. While dragging a block, all other tiles are static/obstructions so you can't move blocks in all directions.
edit: I've also added some instructions to the main post :)