I liked yours too. I particularly liked some of the liberties you took with the melodies of each theme throughout the song (one thing I didn't really do too well). The song felt like it took a little while to get going, with the same Quick Man melody playing up through 1:31 (nice little effect there by the way). I agree that some of the Flash Man parts sounded forced, particularly the introduction of the theme at 2:22 felt a bit awkward. I think it changed keys too, which disrupts the flow a bit. If both themes were transposed in the same key sig, it would add a bit more cohesiveness to the song, making it sound like one piece, instead of two separate songs. Again, I like the little improvisations you made on the melodies though, it adds a nice touch of originality to a very over-remixed theme. Overall I like the "chill" atmosphere of the piece and your instrumentation choices too. Nice work!
And yeah, my song is a bit quiet, but that's because I apparently suck at mastering. I can never get the volume levels adjusted the way I like.