Since there wasn't a proper changelog with this release, I'll summarise what I've seen based on playing through to the end of the current demo (and failing to find like ~40% of the secrets)
- New plot (actually pretty decent)
- Lots of new monster girls
- New map regions. Auria tower, Biscotti plains/forest/town/tunnels, Night dome. Each area also has it's own unique puzzles instead of just the "put coloured shapes into slots". Fights also have different modifiers as to what appears on the matching field (the area with the onyons you match to get mana).
- You can now recruit enemies into your party as allies, and rank them up. Some saverooms will allow you to adjust your party composition (a deck of cards will appear next to the clock in the saveroom)
- Each character has their own shape fight attack. Vuu still shoots projectiles, but Rose has boxing gloves and T lays mines or throws grenades which do AOE. Other recruited party members also have different attacks.
- You can change characters during fights. This swaps in the next character in the party along with all their spells and heals a little bit. You can only do this once per character in the fight, all the way back to the character you started the fight with.
Also the music slaps way too hard. The music has no right being this good.