I must add that the song seems rather repetetive. This is very normal when starting out, as I did it too To improve on the note of repetativeness, the second time you go through the zelda theme, add variations, flips, and jumps!!! ....I don't know, be creative!
Also, the left hand sounds a bit nonhuman, in the sense, that it doesn't flow smoothly and just kind of cuts in and out while the main theme is playing... Firstly, try extending the notes just so they dont seem too chopped. And maybe add some more notes inbetween that help accompany the melody smoothly.
This could become something amazing!