Fun game! In my first attempt I went into the fireball room, misjudged the pattern once and then died by two blasts. On my second attempt I went to the library room first, which increased my health to ~25 iirc thanks to the secrets, so I felt more comfortable to go through the fireball room again. This time I dodged all the fireballs \o/ so I didn't even need the extra health lol
Combat felt nice, and the bossfights were cool. One of them gave me a light panic early on, but I didn't have much trouble getting rid of them. The spinners did their job quite well and the teleporters were also confusing but not in a frustrating way.
Could use some more variety in the dungeon itself, as it does look quite same-y all the way through. Some more visually distinct areas would be pretty neat, I think. Some rooms felt like they have purpose, while others are just there. I think adding some purpose by adding visual clues and whatnot would go a long way to make the dungeon feel more interesting. I know there's furniture, but the architecture itself and the styling could use some love.
Other than that, not much to comment on. Pretty solid game, good job!