Really nice remix, has that very fun, fast pace kirby-esque vibe to it. You should try looking at filling in the bass sounds just a tad more, particularly from around 0:30-0:50. Something like a subtle synth pad could do the trick. I think you could also try adding in a plucked sound throughout, I had in my head a plucked violin/cello sound.
Finally, if you wanted to add a trumpet section in then you could do so with gentle crescendos following the basic chord progression. I find brass can be very difficult to achieve a nice sound, and this piece won't suffer without it, so don't get too hung up about that.
All in all a fantastic remix that could well be near completion, so well done!