I think 2 simple tweaks could go a long way toward making it sound 'more appropriate':
1) Make it louder. It seems like there is a volume drop between the cold open and the title music. So it feels 'weak'.
2) As much as I am not a fan of compression and bloated bass in my music, in this case it would be most welcome. This song is not for an audiophile's archive, it's supposed to be a heart-pumping cue for an adventure to come. So by all means, up the db on those lower frequencies, stat!