This needs more work.
It sounds okay but there are some things that need to be tweaked and added to. The riff from 0:21 to 1:59 is way too repetitive and needs to be spiced up A LOT. I thing the main thing i don't see is a melody. That could be added as well as a harmony for it. May be you should add several different drum beats to help and this includes transitions. You did good with the beginning. Keep working at it and it'll be good! I recommend listening to other music and taking notes of how each instrument is played. Like alcatraz5 said, try to avoid default plugins. I hope you will continue with this project because you have the basic skeleton but you need the rest.
Not bad for just learning FL
But avoid using Slayer. Try some non-default VSTs.