Nice work -- I played to the end (though in fairness I had seen the hint about the final task) and had fun playing it. The music is outstanding, it adds so much to this game atmospherically. I also liked the sound effects -- especially the shaking of his head at the checkpoints. The character is great and the sprites he picks up along the way were very fitting. Things like the checkpoint animation and skeleton-salvaging add personality to the character, too, which I liked. The parrot switch mechanic was fun; in further development you might consider preventing the parrot from flying off screen (for me, this resulted in the parrot coming back on screen stuck behind walls, though switching back to the character remedied it), and perhaps locking the player movement upon switching to the parrot, to prevent him from sliding.
I had fun, nice work!