Here's a big list of patches made:

• Added keyboard & mouse support (Finally!) 
  • The scroll wheel and mouse navigates the menus and the keyboard is for literally everything else
• Added the following courses as a bonus:
  • Reddit Road (Thanks LilFlamie)
  • SD2 Hill Top
  • PWR Retro Maze
  • XXL Demo Course
• Overhauled the following courses:
  • SNES Mario Circuit
  • SNES Rainbow Road
• Added a tutorial that is automatically loaded the first time you play (and can be played anytime via the main menu)
• Added more billboards, so now from a total of 5-ish we have about 25
• Options now save and will load once you start the game again
  • Except for the billboard toggle
• A Roster Size slider so you can either choose from a traditional cast or a Smash Bros. Infinite fever dream
• New splash screen
• New credits music (Miss Clown singing Virtual Insanity)
• Squash & Stretch has been added to the player and certain obstacles to give more life
• Character Select icons have a fresh coat of paint
• Some songs got replaced with more appropriate choices
  • And Some courses have special Go-Go Gates Music
• Character Select screen no longer breaks if you violently jiggle your stick around (I know what you are)
• You probably aren't even reading any of this shit