Tons of changes and additions:

• Rewritten puzzle engine: Namely, the puzzle generator and solution checker are more robust. This has allowed me to expand the scope of the game and address many long-running issues, e.g. the game finally supports words with duplicate letters.
• Three new difficulties introduced: Each difficulty corresponds to a different sized cube, from 3x3 to 7x7.
• Win condition changed: You now have to match your goal word at least three times across any faces of the cube to win a game.
• New color themes: You will experience a greater variety of random color themes as you play.
• Updated cube controls: The cube now controls more naturally, with momentum and drag.
• Remixed/remastered audio
• Various performance optimizations: specifically to address problems with the in-browser version.
• Source code and assets released:  github

There's more but I don't remember. I have no further plans to work on this game, so this is effectively the final release.