When I heard the music I said... amazing... until I saw that it's actually from other games... Damn when I saw "FamiStudio" in the "Software used" I thought you composed them yourself (^.^;
I think there's nothing much to say here... I kind of wished the game doesn't send me back to the beginning when I die, considering this is not a short game.
Art-wise... just some tip for next time: When doing pixel arts, keep the pixel sizes consistent. The BG has big pixels while the char has small pixels and it's... unpleasant to look at.