Keep trying and working on what you wish to achieve. I won’t be installing this as I dont need it but can see how it can help many.
@Junaid433 I found some more bugs for you. 
In the settings, the option to “check updates at startup” does not. The app does nothing on startup.
When dark-mode is enabled, the pulldown option to select the AUR helper app is hard-coded to a white field so appears white-on-white text AND the focus is hard-coded to hover over EVERY app. To replicate, click the pulldown menu to select yay/paru, then without selecting anything just open another app (browser, email, etc.). The below screenshot doesn’t show the option window because the yay/paru selection is even focused above spectacle.
Also, after selecting yay as the aur helper, and pressing the big green “update system” button, GUIMan did not update the aur apps that I knew had updates. I had to run yay in a terminal manually to update.