It's a "song"? If so, then I think it needs lyrics and a melody!!
Otherwise it's a 'composition' ... well that's how I think of it anyway.
Also you've got every section in the same key area, and used one mode throughout. It's usually wise (not always) to differentiate the sections of a song more obviously. You can use changed key, changed chords, various melody changes, whatever lifts the chorus and makes the verse 'versey' and the bridge 'bridgey' - this is easier to do if you know the lyrical story that you're trying to tell.
From the formatting it looks like you are playing a 2 note chord for every note of the song. On bass, I'd generally avoid this. But maybe I read your tabs wrong.
