It's cute. I like both songs, so it's cute seeing them properly mashed up instead of that awful overlay (though that was more for comparison's sake I reckon). It's messy at points, but works lyrically like two friends encouraging each other over an uplifting arrangement. Good stuff!
I know I'm opening up a can of worms here, but it bears mentioning with every Brave/Roar comparison, I just think it's funny Katy can get away with having Roar sound so bloody similar to Brave but no one is raising their pitchforks like when it was beaten to death that Gaga's
Born This Way and Madonna
Express Yourself had a similar chord progression. It's a little funny.