Constructive criticism: 1. Remove ads. The goal should be to get as many people to enjoy the app. Nobody likes ads, and it ruins the user experience. Especially for something like an app for wallpapers. 2. Lower the price of the app. $12 a month, or $50 a year is too much for something thats as simple as a wallpaper that people can get online for free.
The 'competitor' app, WallpaperZ did a cleaner job. No Ads 8K wallpapers No need to watch an ad to download a wallpaper. 2/month or 20/year. The reviews of both the apps on the App Store say it best.
