Art is great (capture that old castlevania feels a bit), I like the choice of music as well.
I liked the design of the boss, but I had lots of trouble with them. Some of theirs attacks have a huge hitbox (You can jump on their head, and they still hurt you there).
The wizard has an attack that ignite the ground, and he will use it twice in a row right at the start and you won’t be able to dodge it entirely. I also feel like I cheesed him because I couldn’t beat him on the ground.