Great game! Left some positive feedback in the comments already, so will leave some other here as well. I wish it helps.
I felt the up and down arrows kinda hard to get the timing, they have a shorter time to preview and a different preview time than the side arrows, making it rather confusing. I think the game would work great only with the side arrows, and focusing on making the timings more strict or something. If you wanted to add a twist, maybe another kind of cue. Maybe a huge line circle that shrinks and you have to press space or down. This would be different than the arrows but still have the same preview time.
The main menu has an empty button? Below the play, there is a space with nothing for some reason. Maybe some cut content? Or a bug?
As a side note, does the arrows timer system syncs with the dsp time of the audio system? Or they are currently running independently and you hope it doesn't desync? Because there was one occasion I felt it was a bit off
Other than that, really impressive project for a 72 hour jam! Congratulations to all!