Would it be an easy fix to make multiple inputs at once on the same side work? It doesn't currently register when you try to play any more notes on one side if another key for that side is being pressed, and I feel like it would be useful and allow people to create harder maps if that were not the case. I totally understand if that's too much of an ask or if it's just not a priority btw, you seem busy with other stuff lmao
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Unfortunately that's a limitation of the way Godot handles inputs by default as far as I know (when inputs are bound to the same "action", holding down one of the inputs bound to it will mean that pressing a different bound input won't activate the is_action_just_pressed() function, which is used for hitting notes). There might be a way to fix it by making a custom input handler, but that's quite a bit more work. I'd like to do it at some point though