Thanks for letting me know; mind if I ask what browser/OS you're using?
I've had a few reports about this so far and I'm trying to correlate.
chrome, windows 7
I just pushed the 1.0.1 build which (hopefully) resolves this issue. You may want to clear your cache, just in case.
Movement controls are enabled once the best score's been retrieved, but it could potentially fail, preventing the game from giving you control. I added a failsafe to enable controls right away and disable the best score in case that happens.
Please let me know if this fixes the problem, or if this still happens.