Oh wow, that's an impressive entry!
The graphics are absolutely beautiful. The pixel art is crisp and the animations are really good! That ending transformation is stunning, absolutely wonderful job Qitsunne =). I really enjoyed the story (that's a LOT of cutscenes and story telling for a 7-days jam oO), the atmosphere, with the graphics, the ambiance, the sound design... I mean, implementing footsteps in a game jam is the epitome of polishing =p.
The gameplay is also really good! At first, the game was a little bit too hard and simple in my opinion... Until I found out that I could roll >.>. My bad, I'll read the instructions more carefully next time =p. The combat was dynamic, and each upgrade really felt good (too bad you cannot play a lot with the fireball, but hey, I understand the time constraint =p).
I only have a couple of nitpicks. First, I would have loved to have a little "X enemies remaining" on the screen, instead of needing to check everytime. It was especially painful in the last "maze" level. I probably should have counted myself, but having that information on screen would have been a nice feature ^^. Then, the game is too dark. I mean, I understand that the ambiance needs to be creepy, but I find the enemies a bit hard to see, and the dark-blue bar in the UI is just invisible. Finally... Well, I want to know the end of the story =p! That's probably the best cliffhanger of all the jam games I ever played, now I want that bossfight so hard xD!
So yeah, overall, that's an impressive job. I'm amazed by the amount of featureq you managed to squeeze in 7 days, mad props to you!