Proto Krūvtah

Consonants
Phonology by Kauf

Vowels
There are no diphthongs, only vowel/semivowel combinations.

Any non-palatalized consonant can be labialized, but such a consonant can't be word-final or any part of the cluster.

The vowels [e i] trigger palatalization, and whenever they follow a retroflex, uvular or glottal consonant they become [ɛ

ɨ] (after retroflex) and [æ ɯ] (after uvular and glottal)

The vowel [a] becomes [ɑ] after uvular and glottal consonants, and [æ] after palatal(ized) consonants.

The vowels [o ɔ] become [ø œ] after palatal(ized) consonants, [ʌ ɒ] after uvular and glottal consonants.

Syllable-final nasals cause many vowels to raise [e a o ɔ ø œ] > [ɪ ɜ u o y ʏ]

Most vowel qualities reduce when unstressed & non pre-tonic [i e] > [ɪ] [ɛ æ] > [ɛ] [ɯ a ɑ] > [ә] [o ø] > [ɵ]  [œ ɔ] > [ɞ] [y ʏ u] > [ʉ].

Vowels were lengthened in the open stressed position. Vowel length became phonemic in some dialects when certain consonants dropping also conditioned it.

(@Kauf, in case you miss the old vowel system I'll make the descendant I create sound changes for develop it.)

Phonotactics
Any onset consists of at least one consonant, this being either a plosive or a non-glottal fricative.

Overall, the syllable structure is (C)(C)CV(C). Three-consonant onsets consist of either two plosives and a liquid or a fricative, plosive, and a liquid. Two-consonant onsets can consist of any two consonants of any type, but these can't be of the same type and PoA.

A coda can consist of any consonant, of any type and PoA.