Actually there is a difference between v1.0 and v1.1, although it doesn’t really effect gameplay. v1.1 has some issues with looping music. In certain stages music from a different level or part of the game will start playing when the current level’s theme finishes. For Example: In Welcome to Ant Island the Bug Bar theme will start playing as soon as the level’s regular theme finishes.

TLDR; v1.1’s only difference is audio issues not present in v1.0.