Oh lord, abstain from video game music at any sort of competition. Playing anything from a game is probably the stupidest thing you could do.
Reason being:
1)I have always noticed that at any competition *I competed in both symphonic and drumline comps*, video game music is judged so hard because they are a more familiar tune to more people *compared to more classical music*, so people would easily recognize anything hit wrong.
2)The majority of the others there will think you guys are pretty gimmicky, as well as a lot of vulgar words. It just makes you look bad. *this only applies to well known popular game series. I have heard a band play the sinistral battle from lufia two and it was sick, everyone cheered, and only about 3 of the whole entire crowd knew which game it was from*
It is your decision, but be careful about what game you choose. A concert is one thing, but a competition can be tricky to choose a song for.