With the jam being over now, I've updated the game. I didn't change the timings at all, but instead I added two things to help give the player more information. I added lines to let the players know when to press and the wave particle now changes colors with each color representing a different state. Green lets the player know it is in slower speed, Blue lets the player know that the particle will change speeds soon, and Red lets the player know that the particle is faster. Also you were correct in your first point with the web version having issues, but it is related to the sounds, what I mean is that the song might be slightly delayed in the web version. I've noticed when playing on browser, the music sometimes doesn't perfectly align with the gameplay the way it normally does which I couldn't fix unfortunately.