What do you think about mixing styles in a game? Like using retro styled art combined with "non-retro music" in the same game?

We tried this approach in our LD game, and I think it's kind of cozy, but I curious to know what you think.

https://ldjam.com/events/ludum-dare/51/rocket-madness

Also, it would be interesting to hear if you have any examples of cool Art style mixes. :-)