Ahh I saw the video of a few videos with this skin and I finally found you!
A few things to point out:
The clear mark should be クリア (ku-ri-a) instead of the つリア (tsu-ri-a) now 
Fireworks.

Don-chan is not moving very smoothly just yet. Hope it's already addressed in your new versions! (If you like, try using Wii5's sprites. They seems better for slower frame rate like in osu)

Small drum's rim color is a bit off to me, too dark.

Frank's note faces looks more authentic.

Combo voices are PSPDX. Not complaining because at least much realistic than the pre-DS3 stock, and I know how hard AC0 samples can come by.

A 2P set with Kat-chan and blue backgrounds and stuff please (/>v<)/

Naming: It looks more like Wii U1 than AC0S, given your choice of result screen elements