In the latest build of the game, the vocal track for Spookeez is slightly delayed compared to the music and arrow inputs, making it very annoying to play. I've tried both the browser and desktop versions, and encountered the problem in both of them.
(and hey, developer person, if you're reading this, I'd like to request implementing that menus don't reset to the very top option after finishing a song or chapter. having to set the difficulty back to hard every single time after a song gets old fast, and it's always very slow to get to the songs in the middle of the free play list.)
