It's okay, but...
The song doesn't go anywhere, and it's missing the feeling of fullness that makes the music in the original game so engaging. For all I know, it could just be a simply made loop. There's no real buildup to an ending or anything else. I mean, no offense, but it doesn't sound like you put too much effort into this. From what I can hear it sounds like it only has a maximum of about three instruments, which, from experience, I can say don't take much work to melodize together.
It's also too much like the original. The point of a remix isn't just to take the original song and make it with actual instruments, it's to make your own rendition of it. True, it is satisfying to remake a song you like in a program like FL, but if you just do that, then you aren't showing any originality.
The one good thing I can say though is that the instruments do work together, and that's more than I can say for some of the other stuff that I've heard on newgrounds, so good work on that part.
Next time you do a videogame remix though, try working a little harder to put yourself into the song instead of just taking someone else's creation, changing the instruments, and posting it on the internet.
newgrounds.com — Your #1 online entertainment & artist community! All your base are belong to us.