RX7 - expensive tools.
The vocals sound as they're in a different room to the music - the backing vocals emphasize this too.
You could try throwing a reverb across the whole mix that is close to the effect the vocal seems to sit in - it would sound quite 60s as well as suitably spacey.
Very energetic song, melody & mix.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe