I'm just gonna leave some general mods because it might take a whole paragraph to point out every concerns:
Easy: I think the patterns should be spead out in between to hands, instead of anchor like 00:00:161 (161|1,474|1,786|1) or jack in 00:02:661 (2661|3,2817|3), 00:03:442 (3442|0,3599|0) which break the RC.
Normal:
I guess you’re going with vocal approach, which is fine, but there are some instrument sounds shouldn’t be left or use inconsistently, maybe you should revise the map and try out more patterns. Maybe you’re a new mania player/mapper, so I would suggest you play more to get to know how mania works differently from standard, read some guides and rules to get the basic fundamentals of making a mania map, and try out new stuffs (patterns, svs, hitsounds, etc.). Good luck ‘w’
Osu!mania RC: https://osu.ppy.sh/wiki/en/Ranking_Criteria/osu!mania
Osu!mania mapping guide: https://osu.ppy.sh/wiki/en/Guides/osu%21mania_Mapping_Guide