Hi Rahi! I really love the work you've done on the software and yours is one of the only ones that have phoneme detection! I was really excited to see it!
I noticed that in the talk phonemes, Open "A" often detects any "O" sounds. Will Phoneme Detection be expanded on later? If not, would it be possible to ask to add Open "O"?
the mouth shapes are already quite hard to split as it is.
try saying "dog" and "chart" in the mirror and you may notice the mouth shapes are very similar anyway!
the 5 options are a good minimum to make it look convincing and i think adding more will only deter people from making the extra art for them