are you playing the game in the browser on did you download it?
yeah some people complain about a slight delay in the browser. The technical story is (for those who think this stuff is interesting) that the browser version works mainly on javascript and HTML5. The browser allocates a certain portion of it's memory to do operations to run the game. But if the browser also needs to do more stuff on the background (especially if you are doing more things like visiting other websites)... we'll you guessed it, then certain operations might queue up and the game will run a bit slower. Sound is handled a bit differently (it's bufferd). So if the buffer and other operations go out of sync. well then the game feels a bit off. Sadly there is not much I can do about it other then offer you a downloadable version.