In my world, I have a race of humanoids who speak a language called Gé̃kt, which is derived from various Eastern Iranian languages such as Khotanese, Ossetian, Yaghnobi and Bactrian with a dash of Persian (a Western Iranian language) thrown in for good measure. However, these humanoids lack lips and I have no idea how this traits would affect their speech.
For reference, here are Gé̃kt's constants and vowels.
Consonants: pʰ p p' b f v m w tʰ t t'd tsʰ ts dz s z n r rr l ṭʰ ṭ ḍ ṭsʰ ṣ ẓ ṇ ṛ tsʰ tṡ dż ṅ y kʰ k k' g x y ṅ h q qʷ m t͡s t͡sʼ d͡z t͡ʃ t͡ʃ' d͡ʒ χ χʷ ʁ w j ɫ
Vowels: ι [i] ο [u] ε [e] α, ο [ə] ο [o]? α [a] ει, ι [iː] ο [uː] η [eː] ω [oː] α [aː] e æ o u ɨ ɛː ɔː
What sounds may they use to communicate?