00:21:517 (2,3) - Would avoid stacking circles underneath sliderends like this tbh since they can be difficulty for new players to read.
00:29:955 (1,2,3,4,1) - Would just do a linear square with consistent spacing, believe this abuses time distance equality a bit much on an advaned since 00:30:330 (2,3) - the spacing here is way smaller than 00:29:955 (1,2) & 00:31:080 (4,1).