All changes were made from watching the existing ddpcv video footage, then recreating them.
Follow this link for more detailed information and lots of handy comparison gifs/photos (just follow the links on the first post).
If you don't want to click the link, here are a few quick images for you:
New Level Palettes and Tiles (original on left)


Updated bullet patterns (original on left)


Hyper Mechanic (left) & New Enemies (right)


Animation changes (original on left)


Lots more stars in lots of places


There are many more changes... new scoring meta, new boss patterns, expert game mode, more bullets, bug fixes, bonus features, etc. so check that link above if you're interested.
A couple folks are testing it now. In a few days, I'll post the links here (and at arcade-projects) so anyone can try it. I'll be collecting more broad community feedback for a couple weeks, will make an update if needed.
Hope you'll want to give it a try!