First of all, there is no "one size fits all" attitude in angel investing. I will tell you that the *best* angels will make a snap decision by playing with the product and assessing founder/market fit. At the right valuation, the kinds of angels you really want backing you will invest purely based on a killer early product experience and conviction of founder/market fit.

But if you have made your app available in the US app store already, you have made a critical tactical error if your app isn't already trending towards 100,000 installs within the first 30 days of availability. Apps should first launch in a non US, english-speaking store to do early product/market fit work.

Your "day one" event in the US app store matters to seed investors and many angel investors. While there are exceptions (most often in SaaS or enterprise mobile models), there are only 4 times to raise funding from seed funds for a mobile start-up stage company:

Pre-product: A deck, a market opportunity and a team.
Pre-launch: Product fully built but holding launch for funding. This will usually involve a private beta of at least 1000 users or a soft launch in an international store.
30 - 90 days after US launch: Must be at or trending towards 100,000 installs with very strong month-over-month growth.

If you miss those windows, the next time to raise is after you pass over 1,000,000 with strong retention and engagement that correlates to your business model and user personas.

As a mobile-first entrepreneur and angel investor, I'm happy to talk to you about this in more detail