You don't keep a constant rhythm mate, also you apear to be hitting bass notes too much.

Practise with a met eh?
I played it along with a metrenome, lol. Just set a met to 90 or so bpm and it'll match up perfectly

Also, I actually hit less bass notes than the original song. The original hits a bass note every downbeat, I hit every other downbeat for the bulk of the song.