Oh, thanks for such a detailed review!!!
Yes, many aspects of the fight and the dungeon clearly need some improvement. I've already noted this, and I'll definitely make some adjustments in future updates! Thanks for pointing this out!
And HOORAY! You're one of the few who found the "secret room"! Honestly, the skeleton parts already point to this room, specifically those fingers scattered throughout the dungeon, hehehe! But yeah, I guess I made the hint too heavy :D
Thanks again for the review. I try to monitor and notice every detail, so you're helping us improve the game!