Another problem is the lack of pauses after 1/16-1/20 of mapping (for exemple here in 00:19:405 (34,35,36,37,38,39,40,41,42,43,44,45,46,47) - Kantan uses 2/1 and 4/1 as ryhtyms so, in this case, every 8-10 2/1 (or 4-5 4/1) you need to put a 3/1 pause.
Your kantan map is more similar to a futsuu. For example: this part in 00:13:089 (24,25,26,27,28,29,30) has a lot of 1/1. 1/1 are not used in kantan if not very rarely. Kantan consists of mostly 2/1, 4/1, or slower rhythms. When mapping kantan, try to follow the most simple rhythm you can use and follow ranking criteria if you want to rank a map. https://osu.ppy.sh/help/wiki/Ranking_Criteria/osu!taiko