The webgl game isn't working, In most charts I spawn missing some invisible note, getting my life to 0 and instantly failing the entire chart, even before I can play at all (the end screen also says I missied hundreds of notes by starting the level)
Thank you for reporting this.
But I'm sorry, I couldn't reproduce that bug in my environment.
Does the music start playing from the middle?
Or is it taking too long to load?
These are the reasons I can think of now.