Ask HN: I'm making an iPhone based Simulation Game. Advice?

After spending nearly a day playing this->http://www.youtube.com/watch?v=DsMMnnOp7RU.

I thought, wow, if someone made this for a genre i found more interesting i would LOVE it! That genre being music.

So, as you all would know. I got started planning how i was gonna make it.

I came up with the idea of a sim, based on running a record label. Similar in structure the aforementioned game except i would add a few more things that a music type game, like this would need.

I'm completely new to this however and would like some advice on executing it.

I've built a landing page: http://beathub.net

And have already got some buzz and early signups going.

I'd like to know a few things.

1. Is the game as far as you understand it, something you would buy?

2. What suggestions do you have?

3. Do you know any great graphic designers who have experience with games?

Thank you in advance

Tapha.