Apparently, I don't see any notes or a way to play the game. I tried waiting for the entire duration of the song on every single difficulty in freeplay, but I still don't know how the game works (or if the chart was blank in the first place).

However, once I tried creating my own chart as a test, it had some notes, and the game itself actually worked. I think the default chart provided in the free play was broken.

I hope this was fixed.