The web version isn't working for me. I tried Firefox and Chrome but can't get past the start screen. I tried Z, X, Space and Enter. I clicked around the screen several times. No progress. =(
OK, I just noticed you need to click on the mute button on lower right corner of the game area and then the game has focus. Clicking on the game used to catch the focus but for some reason doesn't do it anymore.
EDIT: Also the black area around the game seems to work.