I got back on the game to try extra content which caught me by surprise. I'm gonna try to beat that tonight, and yes this isnt my first bullet hell I'm really into Enter the Gungeon and The Binding of Isaac. I also love the soundtrack it really goes with the game.
really fun game, but I beat it on my first try. I recommend to make it a bit harder/add a harder mode where you only get hp on the end of the rooms and to add more smaller enemies inbetween bosses. I felt like I had too much health.