Just commenting to confirm that I had the same issue... for C'est parfait ! and for Oui, j'adore ! It would mark my pronunciation of the words correct (in green), but the exclamation mark would be marked as incorrect (in red), and it would ask me to repeat or skip the phrase. Finally ended up marking "skip" for each of those.
Unrelated but also in the convo: When I first tried the first French exercise on my laptop (Je voudrais un tee-shirt), it could not understand anything I said. I tried them again on my mobile app, and it worked much better (Although not with that sentence, which it recorded as Je voudrais un t-shirt and thus wrong). This could be a hardware issue (better voice recognition on phone, which has French language added), of course, but thought I'd mention it.
It also doesn't recognise numbers, regardless of how you pronounce them.
It doesn't know that deux = 2.
In the "Rendre un produit" challenge, there's a sentence you're supposed to pronounce
Il y a deux semaines
If you pronounce it correctly, the result will be
Il y a 2 semainesThe
2 will be red.