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

(Advance 1) Angel Island Zone.

Originally for Infinite Battle Now retooled

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

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

So far. The Super Transformation is far from completion. (Super Sonic Sprites by "TheKnucklesMainG4")

(coming some time soon or something.) The 1st Sonic Battle Redux arcade Run: Sonic.

(Not finalized yet but its a resemblance.) I have decided to make it 3 Buttoned. Though the Basic attacks mapped A,B and C buttons will also be mapped to X,Y and Z

Giving the character's Icons some polish.

(Will be in the next update)

Basically

Valgallah's Cream's "Chao Force" Super

Command is

D,DF,F X+Y

The "Big Green Man" (Guest) teaser.