Here's my let's play of your game cerealwaterfork!
Overall really fun game, getting new hearts and souls from monsters was a great gameplay loop, it made you wanna progress to see what new party members/hearts/souls and new moves you'd get from each new area. Also the difficulty was just right, quite difficult, but not impossible! Also the story was interesting too, and I quite liked how it was just in the background and not the main focus.
Probably the only problems with the game was levelling up. I loathed levelling up. I'm guessing it was a restriction of VX Ace you made it in, going through the level up menu each time was a major pain in the butt.
Also the way you get the syringe is a bit whack as well, probably should put it in the first room instead...
Otherwise, fantastic game! Good job!