Ask users for feedback and permission to contact them

I might be overthinking this.

We have an app that doesn't have user profiles. We would like to ask for feedback from our users by asking for them to for contact details?

Is this a smart way to go about it?

If we just give them our email - how likely they would respond to it? Is it better to ask them for their contact details?

I am afraid that forms/questionnaires are just to clunky for user to use (I personally would never fill them in) and will not capture the essence of the user interview, ie. we would love to talk to people and learn what leads them to repeat use of the app.

And if we do ask for their details how does this sound?