Bold choice with the vocal intro! It is a very fun main theme. My only comment is that the drum beat seems to come out of nowhere! A little more introduction, maybe a short fill would be better served here as an introduction to the drums, especially as the pattern doesn't change for the rest of the song. The bassline makes my head bob, and the melody feels super epic and I like that it is echoed in the beginning on the bass. The sound effects are great, I can tell that you had a lot of fun making them! Overall very nice work!