The visuals are great, and the music is really cool! I'd like to see more effects tho, like glow on the A/D buttons when you press them, some particles and stuff like that!
But something that really confused me was the fact that the hardest song only had 4 notes. Is it supposed to be like that or that's a problem with the web build?
I won't rate the game based on that experience, because I'm assuming the web build is broken. It would be really unfair if I did that.
I'll comment again after playing the windows version of the game.