Oa

Oa is a language created by Edgar Grunewald for his YouTube channel Artifexian.

Pronunciations and Writing System
The first two videos here would give a proper explanation of Oa's pronunciations and other aspects.

Phonotactics
Oa's fundamental syllable structure is (C)(C)V(C)(C).

Numerical System
The numbers and their words are explained in the third video.