Definitely could be in a Kirby game. Not sure if it's specific to magnetism, but the "boss battle" vibe comes through nicely.
Mixing-wise, I recommend using normalization to increase the volume so the listener doesn't have to change the volume when listening to this song specifically.
Over all, nice job. :)
More info about how I review music here: https://codefreq.newgrounds.com/news/post/1089806