This is such a cute little game! I seriously dig the aesthetic - kinda wish you all had gotten to go all out and finish what you were aiming for. At this level of polish I KNOW you've got something good cooking up!. You probably know all this already, but maybe there's some stuff in here you haven't heard yet:
- The UI is gorgeous, but maybe separating out Instrument Selection and Beat Placement into two separate rows could save you some UX troubles. I had a lot of trouble having to swap back between edit mode and selection mode and I feel like you could solve that without a toggle?
- Speaking of the toggle, I don't know if it was just me but I think I kept adding wrong beats because I kept forgetting if I was in Edit mode or not. Maybe if you do keep it, you could make it more blaringly obvious when you're editing?
- Maybe have a super quick Lerp for when Melon moves between beats? The jump between spots made it hard to read what was happening - even a quick motion between the two endpoints could help some.
- I definitely know you've got the collision issues where you can end up in walls and such, I feel like with some quick checks you should be able to cover that no sweat.
Nice work, y'all! I hope you get to push this past a demo!