Hey there, so I just wanted to report that I loved the concept but I am not entirely sure on your calibration. So I'm a musician and have a pretty developed sense of beat. I went through the calibration exercises and when I started playing I purposefully had to delay my beat a bit to get it to start moving the cube thing. I really think this has potential, but it was very frustrating having to go off beat to get it to work.
My PC is 32GB memory/8 core and was using Chrome. It wasn't a specs issue i don't think.