Nice concept, getting new pieces to get new powers! I find the fighting mechanics not easy at all, as I often get hit trying to kill enemies that have too much health at the very beginning of the game :( They're so many and so hard to beat that I chose to rush through to a horse boss I could not kill... Maybe being able to dash while being on ground would make things a bit easier?
The boss looks cool though, he as an interesting moveset and I think that would be a cool fight if I wasn't so bad. Nice work!