The PC hit still rocks on the phone!
It's osu! as we know and love it with cross compatibility and cross progress with the PC version.
Has excellent integrated support for controllers, mouse, keyboard and tablet via USB.
Also can leverage your phone's full power and play at maximum refresh rate.
I got the full 90fps on the ROG Phone 1, full 120fps on ROG Phone 2 and full 144fps on ROG Phone 3 and 5with only minor dips. Awesome!
As for touchscreen, the game is still balanced around playing with keyboard, mouse and/or tablet on PC so don't expect to break epic hi-scores on mobile, but playing easier maps just for fun is definitely a thing and great fun.
Mentioned games