That's a very atmospheric palette. Some values are maybe a bit too dark, but that may be just this shitty monitor I'm using atm. My biggest concern is the main sprite who doesn't seem to be paying attention to the monsters and is holding the sword like a rose bouquet with the sharp edge towards himself. Make him hold the sword like he means it (this means you have to create a proper battle stance for him as well) and maybe lose the lineart from the sword as well.
