Not your work.
You built this off of a MIDI. Either that or by some huge coincidence you managed to make a remix that just HAPPENED to have every single track laid out in exactly the same way as that MIDI. How do I know this? I have that MIDI, and I've listened to a lot of songs built off of it.
It'd be one thing if you made a small note about where this comes from, but trying to pass this off as your own work is just outright plagiarism.