Don't want to repeat many thing since most of my critic points were already said but what i would add onto the others is the "fast tapping" between lines. like if you attack on the left track you need to wait a second before you can attack the other lines again which might feel weird for seasoned rythm gamers.
Other than that the other points were already said (hitbox, no hit limit for multiple targets)
I like the concept of having to multitask and feels pretty nice once you get the hang of it!
2 things i would have still wish for:
- Audio cue after hitting fans/getting hit by a pebble might be nice. in general SFX for menus and stuff might make the game feel more fleshed out
- pausing while midsong (got distracted while playing and couldnt press pause xD)