Usually I try to finish a game before reviewing it, that's one of the reasons my review took so long, but I'm completely unable to finish the game (Not by glitch, the final boss is really hard) so I will not talk about the story since I didn't finished it
l I'll start with the bad stuff and finish with the good stuff
Bad stuff:
The game is punishing. When I got to the first boss I was completely destroyed and won after many tries by pure luck, most bosses lack a proper pattern I can follow, most enemies and bosses are life sponges also when you are in low heal you can't attack anything, you're basically death. This is really the worst part of the game, the player will become frustrated after a while, but it could be easily fixed by making the enemies do less damage and having less life, maybe even giving way more ash since in one part I had to grind for being able to defeat the second boss,
Good stuff:
It does give a sense of wonder, the mechanics itself are really well made, when I started on the first map I was having fun burning stuff and exploring the map, I don't remember any glitch (With companies like Bethesda this has become a good point), also that ost is lit, in the description of the game it says "Original Soundtrack" I don't own RPGMaker MV to know if all was original but if it is, you have talent
Overall, it still needs works, I suggest changing the game status as "Early Access" instead of "Released" (I also did that with mine) since at the current state it's way to hard, I think you could use this a game as a "Hard Mode" and make a much less punishing "Normal Mode". since this game can be pretty entertaining from the base mechanics