The game is very complete, and the art is amazing, but the combat may need some adjustments. I played for 30 minutes and couldn’t get past the second boss, so I used invincibility mode, and looking at the final boss, I’m sure I would’ve spent hours trying to beat him haha. Most comments have already covered aspects of the game for you to revisit and decide what to tweak.
One thing I can contribute is feedback on the player's hurtbox when touching the boss. Most of my deaths were because of this, it requires extreme precision not to touch the boss, who is large and makes sudden, unpredictable forward movements. Additionally, the bosses have very few openings to take damage.