App Developer needs to be updated. – Gun Builder Review

I really like using this App to relieve stress, or to just have fun shooting things up. I am making my complaint through the review, for the developers of this app to work with IOS 11 and higher. I like to use the same shooting app when I have spare time to play the game, for 10 minuets, so please be kind, read this review, and update the app.
Review by No hold Bars on Gun Builder.