A remix of Sora In The Lands Between by SSJKilam. All of the original is here; this version changes how it feels to play.
Movement
Sora eases into and out of a run instead of snapping, and reaches a run with a lighter push of the stick.
He runs faster and turns faster, and KH2 movement takes over straight after a landing, so you don't get stuck in the landing animation.
Dodge rolls finish about a quarter sooner.
Combat
Every Keyblade hit now does real damage, and a combo's finisher does the most. Before, normal hits often did only 2 to 5 damage.
Swings play 20% faster, and pushing the stick after a swing's last hit cancels its recovery, so you can keep moving.
Enemies still stagger the way they did in the original.
Visuals
Kingdom Hearts effects are no longer cut off by boxes or blinking out against Elden Ring's world. To make that work, they now always draw on top, so they can show through walls.
You need Elden Ring and KINGDOM HEARTS HD 1.5+2.5 ReMIX. It's offline and single player.
Credit: the original mashup, its Sora conversion and everything it credits are by SSJKilam and the people named in its README.