Thank you for the in-depth feedback.
Regarding the 8th boss (the tanky one), I do agree that it needs redesigning so that the player has an opportunity to get some more hits into the actual boss, rather than just relentless attacks.
Couple of questions:
- Did you try playing on Normal mode before you tried Hard mode?
- Did you make use of the downgrade mechanic at all? Its very useful for the boss you spent 17 minutes on.
Thanks again for all the feedback. Good to hear from people experienced with the Bullet Hell genre.