hmmm okay then
i'm not going out of my way to be an asshole but i think i should let you know now that this is going to be a pretty harsh review.
the tune seems to just be random notes from the chromatic scale thrown together haphazardly. dischordance can be wonderful in the hands of someone who knows what they're doing with it but to me this sounds as if you need to take a step back and sit down with some music theory books and start learning from square one. maybe that's not the case. maybe you have a pattern of intervals and you were going for a number of slight key changes in relatively quick succession. or you were going for something else entirely. whatever you were going for with that
there's no real concrete rhythmic pattern here. its just bland chugging with no accented beats or syncopation until like 23 seconds in and even then its like you clicked notes in at random times and thought "that sounds good enough i can't be bothered trying harder to make this sound coherant".
do you play guitar irl? if so you should record that instead of using fl slayer. if not, idk try making a really thin, wirey synth without any detuning and pass that through a lot of distortion and then a combo simulator. it won't sound anything like/as good as a real guitar but it'll be better than fl slayer by a factor of 1000.
now with the drums. uhh... i mean drum... come on man, you put absolutely 0 effort in for that doof-ing kick drum and you know it. i don't even know where to begin with this... i guess the first thing you need to do is listen to some heavy metal and analyze the drum playing and try emulating those patterns in fl. in fact analyze everything and emulate it before attempting to do anything original.
sorry for the length of the review. i'm also sorry i couldn't find any redeeming qualities in this whatsoever. nothing personal but this is really just bog standard listening.