Part 3: 4 more stages with more story content, unique soundtracks, and new mechanics.
Part 1: A new tutorial stage has been added, and the story has been overhauled. 1-3 has been slightly tweaked and is now 1-2. and 1-1, 1-2, 1-4 are removed - They weren't great and had to go.
(for existing players, a code to unlock these stages will be posted to the discussion forums later)
Lots of small tweaks for part 2 as well.
This update was a lot of effort. Hope y'all enjoy!