This remix wasn't everything I had hoped for, which is a pity, as Contra remixes are sadly few and far between. It wasn't the repetition itself that bothered me, but the fact that the mix is a short one makes the repetition all the more glaring. There doesn't seem to be any real notable part of the mix that makes it especially worthy of listening to again.
Also, as a side note: This isn't Contra's boss music, but rather the music to the 3-D stages, Levels 2 and 4.