I'm looking for macOS app to run or play iPhone apps/games in simulated environment. Similar to BlueStacks for Android apps.
Here are few suggestions:
iOS Simulator for MacOS based on Adobe AIR. It supports iPhone and iPad apps.
iPhone/iPad Simulator is available within Xcode (available to download), but it can be run as a separate app on its own. See: Getting Started in Simulator.
For apps designed for automation, see: Android and iPhone app automation tools.