I love the music! It feels thematically appropriate, and is a great tune :)
The art style is strong, especially the 1bit crests that scroll across during loading, and the design of the UI is excellent :)
I'd love a tutorial, whether in game or just on the game page, as I wasn't always entirely clear on how it worked - a few times I wasn't able to attack and a high pitched sound would play, and I wasn't sure if there was a way to know if attacking or defending was the better option on any given turn.
I also found even when reducing enemies health to 0 I'd still get the "thanks for playing" screen and the next battle wouldn't unlock - if it's any help I'm playing on the Windows version