Well done, the game really looks great, especially the characters. I also like the interconnected puzzle rooms (the one for reflecting shots I think should lock you in, I skipped it a few times because I thought a ranged weapon was going to be found later).
I had the same glitch with a text box staying open too, with the dog that teaches you to dig. And I think the player's collision was too tall, it would often get stuck on walls, and the boss' attacks would hit me way easier than what it looked like it should.
A few small things I think would be nice would be health pick ups, though this wasnt really a problem with how easy it was to respawn, would just make the game flow better. Also some things could probably use their own sound effects, like pushing pillars, picking up keys, etc, just to provide some nice feedback to the player. Also maybe pillars that can move could have a slightly different visual appearance, it was kinda awkward that some could move and others couldnt. Still great game!