1.1:
- new graphics
- aesthetic tweaks
- minor level changes
- reduced artificial difficulty in crossing the line (plus other stuff, and made a part of the final level a bit harder and less janky)
- did something to bowser's castle
- added the ability to save anywhere in the overworld by pressing select
- changed all castle clear text, added new message boxes
- made world 1 look a bit more lively
- they no longer have faces
1.2:
- a whole lot of fixes, level changes and difficulty tweaks
- hud no longer goes behind ground on some levels
- some aesthetic changes
- some music tweaks
- new "nintendo presents"
- probably other stuff but i forgot