I'd love to have some BPMs below 120 as well, 120 is only slow if you're already experienced with the game.
Would it also be possible to have early/late/wrong input judgements be coloured differently?
I'd also ask for an audio offset slider but I have no idea how you'd add that??? But at least the default audio seems to have the sound play very early (about 3 pixels before the green window even starts at 120 bpm) on my computer (Windows 11, Chrome)