Thanks for playing and for the thorough description of your playthrough! I too believe that the cat boss is too easy, but also I couldn't make the midbosses too hard, since you can encounter them in any order. It's interesting how you perceived the creepy mask as a blocky thing, haha. That was just me trolling the player a little. It isn't meant to be killed, though it isn't too hard to do so.
I'm glad you managed to finish it even with all those difficulties, thank you very much :)