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

Basically

Valgallah's Cream's "Chao Force" Super

Command is

D,DF,F X+Y

Giving the character's Icons some polish.

(Will be in the next update)

(Advance 1) Angel Island Zone.

Originally for Infinite Battle Now retooled

Silver (With A Counter move with a cost of Power) and Metal Sonic

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

Despite being Water (Or Mutated Chao) slime sounds

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

(Silver Update)

Another Trap attack + A returning move from Infinite Battle + And another intro

I've been a kind of not been posting a lot in here haven't I?

A tad broken but its still functional + a different set of animations for Sonic

I also currently have plans on updating this game's build to the nightly.