This might be the best game I've played all jam. It's such a unique spin (ba dum tss) on Guitar Hero/Rock Band-esque rhythm games, and that genre is not easy to pull off. The controls are lowkey perfect; W, E, W+E, mouse slide, mouse slide+Q is just enough variety of notes, while also reusing keys/motions to prevent the player from pressing buttons all over their keyboard. The (original?!?!?!) music is fire AF and the charts are hella fun to play. I never got above 0 stars, but I played every song and had a great time. Also, you included a track editor??? Absolute peak, I'd love for this to be a full game on Steam. (If you do this and add controller support, it'd be sick if the spins required you to actually spin your joystick).
One thing I wish it had was a notice of whether I'm hitting a note too early or too late (both when I miss it and when I just don't get it perfect). Sometimes I couldn't figure out the correct timing, and feedback distinguishing that would help.