Little sort of glitch. At the end of the x 32 or x64 run, you get a message saying 'Congratulations - Restart?' Rather than 'Play Again?' If you refresh the page instead of clicking Restart, you can play another round except this round glitches at the end and once everything is maxed, there is no option to play again or restart.
Incidentally, the multiplier on the bottom right doubles each time you refresh the page after the glitch and the final 'purple shape' bonus and another old one appear in the bonus box.
Fun game though. Obviously I liked it having played it past the end to the realm of glitches ;)