NOTICE: THIS ONLY FULLY WORKS WITH THE NEWEST VERSION OF THE FLASH PLAYER, SO IF TIME STOPS IN GAME AS YOU TURN, YOU NEED TO UPDATE YOUR VERSION OF FLASH. I'm sure it's worth it.
Also, I recommend making your keyboard repeat delay as short as possible (Control Panel > Keyboard), because you need to hold down left and right often, and with a long key delay, it won't register as holding down for a couple of seconds. The game is still entirely playable and beatable w/out that, but it does make it slightly easier.
Beyond that, the game should run smoothly. It's only 6 levels now (though beating them and getting 5 stars on each is no easy task), but if I get a good response, I'll be sure to add many more.
I'm told the game has a fairly steep learning curve, but after a few tries, you'll be playing like a pro.
I think it's a fun game. My friends do too. Hope you do.