The buttons don't work for me either.
I waited for it to load all the way, and none of the buttons work. I can't click "Start Game", "Highscore", "Customize", "Achievements", "Options and Help", or the 5 odd dots at the bottom left hand of the screen. I have reloaded the page, reloaded the brows, and cleaned out my cookies, but I can't seem to make it work. I have to right click and press play to be able to do anything. That takes me to the customize screen, where I can't click any of the color swatches, or "Return". When I right click and select play again, it takes me to the themes page. I can't click to choose any themes, I can't click to choose the difficulty, I can't click "Return", I can't click the sleeping guy, and I can't click, "Play". When I right click and click play again, it takes me to the options and help page. I can't click any of the arrows, or "Return". When I right click and click play, it takes me to the Highscore page. The only button on this page I can click, is "Return", and it makes the high scores go away. When I right click and click again, it takes me to the achievements page. I can't click "Return". When I right click and click play, it takes me to a page that has a little guy in the middle of a field, has the word, "NaN" on the screen twice in the sky, and I can't control him with the mouse, arrow keys, wasd keys, spacebar, enter, or any numbers. When I right click and click play, an odd chibi face pops up in the left hand corner of the screen. When I right click and click play, the face comes back up. Thats all it does for me.