this is very well made, i espiecially like the decorative portals as effects and your use of colored skeletons and blue blademasters, but you should set the subdivision to 4 if you ever plan to update this
the reason is, there are no notes on 1/3 or 1/6 in this song, and as you might've felt yourself, some notes aren't quite on time; that would be because they should be on 1/4 or 3/4