As a Kirby fan: kudos to you for making this.
Gourmet Race began really well, and I initially thought this was a little slow for Gourmet Race, but I listened on. Initially, part of the melody for the second part of Gourmet Race was missing, but then when the melody came in, it was off key......
That aside, I like what you did with the second part of Gourmet Race: you gave it a rather lighthearted feel, like Kirby's taking a happy walk down some rather awesome, mechanical-looking environment. Applause for that. : )
Mixing is great; everything is heard quite well. The higher lead guitar could be more crisp, because some of the individual notes sound like they're slurring into each other.
Also, what's with the abrupt ending? It sounds.... uninspired.... Pieces need to resolve well in order to last in people's minds. Especially since this is a video game cover and people listen to VG remixes to hear others' takes on it.
And no shame in putting this in the General Rock category, synth or no synth. I have to rely on synths myself, but the piece is still what it is. I won't dock points off for the genre; just be sure to put it in the right place the next time.
Much of my contention comes from musicality. Although by-and-large this piece sounds like Kirby's skipping down this mechanised area, a bit more buildup would've been appreciated if this piece were to remain slow.
Overall: Good concept; please knock out the kinks.
3.5/5.