So, this app likened crypto app store? Which the target audience is cry to enthusiasm? And it's can available worldwide?
It is available globally right now, yes. Currently only an English language translation is provided, however the app and site will be internationalized once out of beta.
What the different than play store?
How about the fact you will be able to buy apps with Bitcoins?

Also by intentionally *not* accepting foreign currencies, it frees up many tax and licensing issues and enables app developers to sell their apps to anyone in any country on Earth.
How it's checking the app which have store on your app is clean?
Right now we manually run new apps through a basic security test. We expect this process to get more sophisticated and automated as we grow. However, just like on any app store, users should use high levels of caution installing any new app, and should research ahead of time whether an app is legitimate or not.