Pretty well written
The problem isn't that you don't have an ok voice, it's that in choosing Lemon Demon to parody, you didn't stick within the singing style.
What I mean is that if you want to follow his background music, the lyrics have to be sung with a certain kind of pitch and meter. Try to find people to sing for you on the forums here, it's a nice enough community with a lot of people who like to take a part in things.
Either way, I'm impressed. This was really creative.