Very cool beatmap, also looks like it's the first CGSS's soundtrack on workshop!
Played until I clear this with full combo, and found some points to fix.

Here's some suggestions for the beatmap:
* Change Subdivisions. It makes it much easier to edit (3,4,6,12 is recommended. Mostly 4.)
* Add two 'BPM Change' trigger to set offset. Let the second one to match the original BPM, and change the first one constantly to match the beat. (Restarting the Level reloads the beatmap, recommend to restart the level right after you change offset and save)
* There's three types of shadows on enemies, Round, Diamond, Star. Making them match to the beat(n or n+0.5) makes enemies' shadow into mostly round and diamond, making gameplay easy. (○Round: On beat ◇Diamond: Half beat ☆Star: Others, from triplets to polyrhythms)
* Change Cover image into 1:1 image. (Workshop thumbnail and results screen's offset issue)
* Change character into who matches to the image of the song.
* Change Composer. DannyB is the default composer.

Here's a video(unlisted) with changes applied, I'll leave the file on the comment sections if you would like to update, or edit it(cuz original is yours)!
https://youtu.be/yOWn-9kT5Lg