The game felt really solid overall.
Love the art style, really different from current games! It felt like there was lots to discover and the world was big even with the thin sliver we could play.
I found that you can stand inside the shadow of the boss before it comes up and if you just swing you can skip the 2nd phase as you do all the damage needed before the tentacles can hit you. This felt a bit cheap so maybe add standing there hurt you when the boss surfaces?
Looking forward to future updates and new cool boss designs!