00:12:212 there's an high instrument here, it sounds similar to 00:11:244 (3) - which it's hitted. you could make this slider 00:12:050 (1) - 1/2 so to make hearable its sound
00:52:373 (3,4) - 3/4 jump looks quite hard to reach considering the last similar patterns had a minor jump instead 00:42:050 (3,1) - 00:54:954 (3,4,1) - , you could decrease their spacing since the current part doesn't require that much intensity