This is almost certainly a Plains Native American language from the Siouan family, which includes Lakota.
I'm basing this off a few distinguishing features:
- it's tonal
- it uses nasal vowels (like in "huh?", sort of)
- there are lateral fricatives (think "L" + "SH")
- the syllable structure is mostly CV (consontant + vowel) [this is a gross oversimplification, but you can contrast that with languages like English that often have more consonant-heavy syllables like the classic example of "strengths", which is CCCVCCC when you analyze the phonemes (sound components)]
