-Menu, character select and VS screen overhauls.
-OH MY GOD THERE'S VICTORY QUOTES
-Everyone now has AI.
Characters + Stages (there's probably a lot of balance changes for the characters I might've missed)
-Samus has been added as well as her stage.
-Dig Dug's stage has been added as well as one more extra stage...
-Power Charge sound has been changed.
-Characters will flash during invincibility frames.
-Knock back decreased on Fireball.
-Raccoon Tail has an active frame and travels faster.
-EX Racoon Tail should not be able to release a caught opponent.
-Hammer Wreck juggles better and can destroy special projectiles.
-Multistomp's command window is tighter if you try pressing A+B when the Stomp connects but you can hold A+B during Stomp's jump and if it hits, it'll activate.
-Wider jump arc
-Standing Strong Punch, Crouching Hard Punch, and Crouching Light Kick startups were decreased
-Crouching Light Kick has a slightly larger hitbox.
-Jumping Kicks have a slightly longer hitstun, Jumping Strong Kick has less knock back.
-Quick Dash (Punch version) is invincible to projectiles and throws during the beginning of the move.
-Quick Dash (Kick version) travels slightly less distance and shouldn't pass through opponents now.
-Dash Punch can punch through special projectiles.
-Power Launcher sends the opponent a little less higher up.
-Power Charge gains a little less power.
-Guard Attack has UC doing a high punch.
-A 2nd dodge can be preformed by hitting back twice during Counter Attack. You can still do a projectile-invincible dash during the 2nd dodge.
-Fistful Fury's hitboxes (both normal and non-EX) extend to the ground (can't dodge this, Mario)
-Fixed a gltich with Scapegoat where UC would get hit during the super pause animation.
-Sewer Brawl is invincible all the way if you land a successful punch and it juggles better.
-Forward dash travels less distance, backwards dash is slower
-Standing strong punch has more recovery
-Guard attack was changed into a hop kick.
-Dagger Toss has more startup and recovery, dagger's knockback is less.
-Backflip (both normal and EX) startup was decreased
-Whip Swing has increased startup and recovery. Can now hit Mario while crouching, can bypass Mega Man's Star Crash and can hit projectiles properly. Hitting with the tip of the whip can knock an opponent down and do more damage.
-Holy River now only spawns 4 flames but can be canceled from Dagger Toss.
-Medusa's Wrath will only spawn Medusas from behind Simon
-Kid Dracula throws out two fireballs and his crouch summon attack has less startup.
-Crouching Strong Punch now launches opponents into the air.
-Startup increased in normal Mega Buster, shots do less knockback.
-Can't use Mega Buster when the Star Crash projectile is on screen and vice versa.
-Startup decreased on Star Crash but the stars themselves can be destroyed by super projectiles before being fired.
-Level 3 starts up 3 frames faster, invincible for the startup
-Protoman shoots 3 bullets per jump in the stand summon. During his crouch summon's entrance, he automatically appears.