Don't worry about it being short. It says all it needs to. MANY songs from the history of music were lyrically sparse, and filled in with musical bridges. If the music is incredible, then this (i.e. your lyric) is all that a lyric needs to be.
And I'll say this again to emphasize it. This says ALL IT NEEDS TO SAY TO BE A COMPLETE LYRICAL EXPERIENCE.
I think this is brilliant. I wish I had written it.