I haven't tried that app myself but I often heard people mentioning to play my games with that over their phones. But the results seem to vary. For some a blackscreen appears at some parts and they can't see anything, which makes it impossible for them to play that way. As you said the quality and results vary.
I assume all features that are handled over plugins and addition scripts are wonky on the emulator since they are not in the base rpg maker core engine and the emulator has problems with proceccing them correctly. But that is just my guess.
But nice to hear that it works for you this far^^ And thanks for playing!