Aa [æ]
Bb [b]
Dd [d]
Ee [ɛ]
Gg [g]
Hh [h]
Ḥḥ (Can only be described as 'breathy-h')
Ii [ɪ]
Íí [i:]
Yy [i:]
Jj [dʒ]
Kk [k]
Ll [l]
Mm [m]
Nn [n]
Oo [o̞]
Rr [ɹ]
Ss [s]
Šš [ʃ]
Tt [t]
Uu [ʊ]
Vv [v]
Xx [ʒ]
Zz [ʒ]
Žž [ʐ]
Čč [t͡ʃ]
CHch [ç]
Thth [θ]
--Notes--
-Vowel lengthening by doubling
[ɛ] to [i:] when 'e' is doubled
[æ] to [a:] when 'a' is doubled
-'-
Unsure of exact function yet. In names, it separates the given and family names (Tali'Zorah and her father, Rael'Zorah)
-y-
Can be a vowel or a consonant
-Digraphs/Diphthongs-
'ch' = [ç] and only appears as such. Is treated as its own letter, though 'c' does not exist on its own.
'th' = [θ] and only appears as such. Is treated as its own letter. (This means that 'geth' is technically a three-letter word)
'ae' = [eɪ]
In-game most Quarians you meet have a Slavic-sounding accent, so I decided to give them a somewhat Slavic orthography. Some do have what sounds like a New Zealand Accent, for reasons unknown to me..
But maybe the actual phonetics could change, with the same language at its core.
Now the phonology makes a bit more sense. I think Quarian would be tougher than, say, Asari, because we already have some preexisting words and phrases to analyze. Speaking of which, I think you forgot a crucial sound: [θ], without which "geth" would sound like "get".