You have a great section at 1:27. Try speeding up the vocal to match that tempo. It's the strongest part of your remix! I think speeding up the vocal would be better than slowing it down. You can always resubmit until the last minute. Good job!
the vocals are always delayed! and try to master the instrumental :) the EQ in the voice is completly different from the rest of song! try also to cut the voice and don't just put the whole track together! try to make some variations on the voice to fit the instrumental better and to be more unique ;)