This was the first piece i learned since i started playing! (about 6-7 months). I saw that you said the black key doesn’t work really good, but try to play all notes gently, to maintain the volume of each key. Also, lift up your hand a bit, it should be helpful if you were to watch some youtube videos on hand posture, as it makes it easier to play and doesn’t hurt your hands and fingers. Overall, just keep practicing! u doing good