Achievements out the wazoo! They aren't up yet on Steam (art is still WIP), but we've introduced a really broad new set of achievements in the game. Notably, a lot of game elements are now hidden until certain secrets are found. We did our best to make use of existing save data, but some things were just incompatible or never really tracked to begin with, so it may take some effort to get it all.
New music, updated art
One new enemy
What's tweaked
Coin spawn rates shuffled a bit, and modified by achievements
Minor graphical fixes and tweaks--there's fewer bricks in world 1 now.