Jacob, what a cool project! It was fun to read, which speaks to your writing skills. On my iPhone SE (2020) the scan-line effect is distractingly low res (1), perhaps because of my lower screen resolution? 1: https://nexus.armylane.com/files/RPReplay_Final1701128035.mo...
I think I know the culprit, my Shader which is applying the CRT effect shouldn't scale the scanlines with screen size, they should be constant sized - I noticed the same issue when you go to the app switcher.