Is it wrong to focus on Indie sites and ignore the mainstream mags and websites?
Yes.
mainstream press is not an enemy, also because indie only press is almost non existant!
If your game is not free you want to sell it and make money, and if you want that you need to advertise your game. So you need every possible way to adversite it, expecially site and mags that talks about gaming, even mainstream, because you know, those site are visited by gamers!
There's nothing wrong with that, it will not make you less indie
send some material around or maybe even make it as exclusive to a big site before the others, it looks very cool!
PS oh I hate that damn techno music on the trailer, tell me it will not be featured on the game