Súiⱥcúili is the language spoken in Súiⱥcúil and Onceuponatimia (Puinⱥtimcel). It is an in-universe conlang inspired by Vegúili, which is spoken in Vegúil. These countries are all located on a planet different from earth. For whatever reason, many of the species of plants and animals (including humans) are similar to Earth species. An extraterrestrial species has some members there; this species may have space travel technology which allowed it to bring animals there from Earth (or possibly the other way around).
[Note: this language is older than my other conlangs so probably isn't as good.]
The vowels are pronounced more similarly to how they're pronounced in non-English languages than to how they're pronounced in English. There are no diphthongs.
a is pronounced like the a in English father. ā is silent.
ⱥ is pronounced like the au in English caught in dialects that distinguish caught from cot. It is similar to a, but with lip rounding. In Onceuponatimia, it is usually pronounced like the u in jump instead.
e, is pronounced like the ai in English air (a sound somewhere between a long a and a short e); in some dialects, when not at the end of a syllable, like e in in English end
i, is pronounced like the i in English machine; in some dialects, when not at the end of a syllable, like the i in English in.
l may be used as a syllable nucleus if it's at the end of a word after a consonant. Like the consonant, it is never pronounced like the English "dark l".
o is pronounced similarly to the vowel in English home, but it's not a diphthong.
ø is pronounced identically to the sequence úa.
rh is pronounced like Spanish rr (i.e., a trill), and is used as a syllable nucleus.
ṛ is pronounced like the er in English her (in rhotic dialects) and is a vowel. However, there is no consonant that sounds like the r in rug.
u is pronounced like the oo in English too.
The letters í and ú are consonants. Other than ā, all varients of vowels (a o o u o u ė ı ō) are pronounced the same as their main vowel.
The consonants are pronounced as follows:
b, d, f, h, m, n, p, s, t, and v are pronounced the same as they are generally pronounced in English.
c and g are always pronounced as they are in English can and get. Neither changes its pronunciation before e or i.
gh is pronounced like a voiced version of the ch in Bach if by itself. If it's in a cluster with an unvoiced consonant (e.g., t), it becomes unvoiced and sometimes becomes pronounced like k (depending on the dialect).
í and ú are semivowels, pronounced the same as English y and w, respectively.
j may be pronounced like English j or it may be pronounced like s in vision, depending on the dialect.
l is pronounced as in English like. English tends to use a "dark l" sound at the ends of syllables; this is not used in Súiⱥcúili.
ŋ is pronounced like ng in English sing. Unlike English, it may be used at the beginnings of syllables as well as ends.
r is pronounced like a flap (like Spanish r).
ʃ is pronounced like English sh (in ship).
sh is pronounced like English z (as Súiⱥcúili has no z and they do have a letter for /ʃ/).