It's just "Urapani!". I'll quote what I was told about what the "Ura" means:
Ura means "back side" more specifically. And it is common to denote stuff that is "more" than something with it. Take the game of Taiko for example - it has the hardest difficulty that is called Taiko Oni, and then there's even harder one that is called Taiko Ura Oni. Meaning that there's something "behind" the highest point.
Essentially, it's just an in-house romhack of Amapani. As a fun fact, if you've been keeping Amapani up-to-date, you'll find that they've added the new character abilities to that as well, so the two games are now completely identical in terms of controls... It's just the levels in Urapani are more likely to make you throw your controller out the window. :V
Anyways, I'll just put this here:
https://www.youtube.com/playlist?list=PLoUS23R3h5anM4pbScyYBijvFoXgHrMnJ
Currently, the only thing we have left to do is the extra world(s), which will be all kinds enjoyment for everyone involved.
I'm still figuring out how to get some of the grimoires, esp. the one in the end of World 4. Any tips?
If you mean the one on the boss stage, then in the long, vertical room just before the boss, at some point during it you step on a red platform on the right side. Once you get to the bottom near the checkpoint (don't hit the checkpoint if you want to be able to attempt it more than once), wait for that red platform to come down, and then use it to make a jump to an area below you to the left. You may need either Marisa or Nitori.
Either that, or if you have multiple players, you can just cheese it by abusing respawns. :V
Oh yeah, dying: That thing that hardly matters in multiplayer. :V
You might be able to do it with either Patchy or Alice. If you can make the jump with Alice, you can just block the bullets on your way down. Patchouli should definately be able to make the jump, and you should be able to hug the wall and fireball the fairies. From what I remember, the fairies fire just beneath your hitbox, so you should only get hit if the glass falls out from under you while you're on top of a bullet.
There's a checkpoint right after you get the book, so you don't have to do it every time you die to the boss.