I got the impression that their atmosphere is very different, because humans had to hide behind the transparent mask to breathe properly. Simply high amount of CO2 cannot do that. Even on earth, we have 70-75% inert gas (for our breathing purpose) and we breathe quite fine. Was it mentioned that atmosphere is similar to earth's?
I agree with your statement about seeing electromagnetic radiation because we see best in the wavelength range in which solar radiation filtered by atmosphere reaches best on earth's surface.
But about audio frequencies, even if the atmosphere is similar, it can carry various frequencies. Humans hear well in only a particular frequency range. Even different organisms on earth do not hear/emit sound in the same frequency range: elephants, dogs, bats, snakes all have vastly different audio frequency sensing ability despite living in the same atmosphere.
But having said all that, still the amount of similarity with an independently evolved species is too uncanny for me to digest. 2 eyes, 2 ears, a nose with 2 nostrills, 2 arms with hand like endings, a navel, 2 legs, tendency to hide one's groin, hair like thing on head and rest of the body relatively hairless? Doesn't seem to be realistic.