Super Mario Bros. Reprise

Plot
After his defeat on the moon, Bowser has been unusually inactive. It's been quite a while since he's attempted to kidnap the princess, and Mario and friends think he might've finally given up for good.

Peace doesn't last, however, as after receiving an urgent message from a faraway land, our heroes learn that the Koopa King has led an invasion on the distant Melody Kingdom and completely taken over!

Gameplay

 * It's a 2D Mario game, I'm sure you know how those work
 * Mario can do all of his moves from the NSMB series: Ground Pound, Wall Kick, Triple Jump, Spin Jump
 * Tentative idea: replace the Ground Pound with the Spin Jump and give the Spin Jump all of its capabilities from SMW (breaking blocks from above, one-shotting shelled enemies, etc.)
 * Playable characters are Mario, Luigi, Peach, and Toad
 * Mario is the all-around one
 * Luigi jumps the highest but is slippery
 * Toad runs the fastest but jumps the lowest
 * Peach runs the slowest but can float for a bit
 * Maybe give their powerup forms different properties a la SMBX?
 * The usual Goal Pole is replaced with something different, like SMB3 and SMW
 * I don't know what specifically yet, but I want it to be something music-related
 * Star Coins also replaced with something music-related
 * Or maybe I'll just put a music note instead of a star on them and call them Melody Coins
 * Secret exits are replaced with rescuable citizens that will open the way to a new level on the world map if you make it to end of the goal with them
 * Fortress bosses are regular enemies augmented by magic from the Koopalings' wands, like in Yoshi's Island
 * Castle bosses are the Koopalings themselves
 * They won't use their lame cookie cutter fighting styles from NSMBW and onward, though
 * Maybe they'll get robots or something

Powerups

 * Super Mushroom
 * Restores 1 HP
 * Life Mushroom
 * Restores all HP and expands the life meter from 3 to 6
 * Fire Flower
 * Ice Flower
 * Super Leaf
 * Raccoon form has no flying ability
 * Propeller Mushroom
 * The vertical distance gained from the rise is much less than usual (now on par with a just a regular jump), and Mario's descent is not slowed after using it
 * The nerf is so the Propeller form can have a different niche than the Raccon form instead of being directly superior like it would be otherwise