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

Sumin didnt just make some characters But also sandbag (Though bare bones)

(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

The "Big Green Man" (Guest) teaser.

(Advance 1) Angel Island Zone.

Originally for Infinite Battle Now retooled

Basically

Valgallah's Cream's "Chao Force" Super

Command is

D,DF,F X+Y

Despite being Water (Or Mutated Chao) slime sounds

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

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

That Hover Move.

It's like the OG game but less stiff.