2/3 of them are references to

Sonic's Concept and is also a Skin in Sonic Superstars Cream's Debut (Though inconsistent looks)

A former 90s rival's (A red capped plumber guy) recent 3D platformer since 2017

Every Continue and Confirming

As of 6/26/2022

Act Music as Rounds? (may not apply to every stage)

I'm taking you down like its 1998/1999!

Early previews of "Shining Wine (Not alcohol)" and "Castle Party"

surprising how i manage to draw King K. Rool accurately like that for the first time

Despite being Water (Or Mutated Chao) slime sounds

That Hover Move.

It's like the OG game but less stiff.

Continue. But classic

Yoshi and Birdo cosplaying as Ichigo Momomiya