I tested your latest release on the Samsung Galaxy S24+
I tried out Phantasy Star IV on the Sega Genesis and it worked with no slow down as far as I can tell.
Quick question though. My phone has 3 resolution settings outlined below. Which would be the best resolution to set my phone too to be compatible with your shader and which one of your presets should I be using with that resolution (4k, 1440p, or 1080p)? Also, not sure if it matters but I would be playing in landscape mode.
Phone Resolutions: 1560 x 720 2340 x 1080 3120 x 1440