Don't use FL Basic drums. FL Studio comes with plenty of other drums that sound good, and if you don't like them, there are literally thousands of free drum samples on the internet. The synths are very loud and annoying. The guitar is too. Speaking of the guitar, the guitar is bad. It isn't very high quality.
Assuming this isn't just a MIDI rip, you accurately recreated the tune by ear! I can what song this a cover of. If it is a MIDI rip, understand that you can get banned for that. Anyway, the mixing is OK aside from the synths. The bass could be a little more prominent, but at parts where there is bass, it's at a good volume. Lastly, the looping point is good. The loop is pretty seamless.
Overall, the sounds you used aren't very good, but you accurately recreated the tune.