Truly beatiful game. The artists went hard and should be super proud!
The gameplay was a bit simple to many. Most of the projectiles never had a chance to hit and it was very easy to stand close to the boss and just smash it (I have similar issues in my game).
The theme was very well utilized. You give up health (sanity) to attack and also when you take damage. The more you risk going low the more damage you can deal.