There are plenty of new rooms, but only two new fights. The reason for this is because I spent most of the time trying to get the shop and World Map to work, but I think I got everything working. Since adding in EXP n' shit would make this too complicated for its own good, I decided to make currency and EXP the same thing. Basically, you go to Brem's shop, and you can purchase a number of upgrades with the score you've racked up. Here are the items with the prices:
Sticky (2x damage): 2000 points
Announcement (3x damage): 4000 points
Banhammer (4x damage and not destroyed by projectiles): 6000 points
Double damage (Self explanatory): 8000 points
Safeguard shell (50% chance you'll take damage from projectiles): 4000 points
Invisibility shell (No more instant kill from enemy collision): 8000 points
Party upgrade x2 (Increases the attack of all party members by 1): 5000 points each
Hot Pocket (Restores health; repurchasable): 500 points
As for the new encounters, one of them respawns every time you re-enter the room, so you can point farm and get more items (If you're willing to waste your time doing that, of course). The other encounter is Tails Doll, who is going to be the hardest (Optional) boss in the game when it's finished (In future versions, I plan on his defeat unlocking him as the game's strongest summon, as well). You're probably not going to be able to defeat Tails Doll right now (Unless you somehow obtain all of the upgrades), as he has 1000 health.
how much *crag*ing health did you give you give yogi bear i mean seriously
nevermind that, it was prolly a glitch or something
ps i beat tails doll with only one upgrade