NetherRealm released an official MK11 mobile game. It is not the full console experience, but it has 3D graphics, Fatalities, and card-based progression. File size ~2 GB. Free to play.
For a second, there was only black. Then, the screen flickered. The familiar, guttural roar of the Mortal Kombat announcer blasted through his headphones, but it sounded… richer. Clearer than any PSP game he had ever heard. NetherRealm released an official MK11 mobile game
Within the PPSSPP settings, go to Graphics > Postprocessing Shader . Selecting "FXAA" or "Upscaling" will give you that "extra quality" look you’re searching for. but it has 3D graphics