Count me as very much interested!

I'd agree the RP doesn't need powers, though perhaps there should be some element of mysticism or magical realism to match Hotline Miami. For example, one person being able to take on huge numbers of enemies or escaping from the police after committing a crime not being that big of a thing. Not Saints Row levels of ridiculousness, just things being not quite realistic. I'm not set on that, just seems like an interesting idea.

As for people playing as gangs or as gang members, I think playing as gang members would be more fun but requires more players.