'Yemls
Although the language has been known for a few years (at least to some degree), there's no culture firmly associated with it yet.
Grammar
Syntax
'Yemls uses SVO order with modifiers following heads. Up to 2 objects can appear. There is neither inflectional nor adpositional case marking. There are no prepositional phrases; something like adverbial clauses are used instead. A definite article is used.
The role of an argument depends on its position and on the voice-marking and argument structure of its head. The voice-marking is unusual in that it only rearranges the mapping of roles to positions; it doesn't delete arguments (and for some words, it can add an argument).
Generally speaking, a content word's syntactical use is independent of its lexical class, the latter affecting only its morphology. Mandatory possessors appear as objects while optional possessors appear as adjectival modifiers.
Morphology
'Yemls is agglutinative, marking aspect, mood and tense, temporal point of reference, and voice. Each of these has a 0-marked possibility, so that the average number of morphemes per word is low. Otherwise, suffixing is used for these except that voice and certain aspectuals use prefixes. Except for haplology and vowel doubling indications, the usual written form of a morpheme rarely changes.
Some pronouns have enclitic forms which can be used in certain circumstances. There's no plural marking, although there are collective and distributive prefixes. There's a distinct inclusive personal pronoun.
Orthography and Phonology
'Yemls is written using a 52 character syllabary, the glyphs of which resemble alphabetic characters. Symbols resembling apostrophes, colons, and hyphens are also used, as are spaces, punctuation, and a few logographic symbols.
The syllabary has 4 vowel columns and 12 consonant rows, representing 48 historical CV syllables, and an additional row, representing historical V syllables. The relationship between the written form and pronunciation is complicated but regular. It involves column-dependent consonant shifts, coalescence of diphthongs and long vowels, high vowel deletion, and a few other details.
Thus, the possible syllable types in the spoken language are (C)V, (C)VC, (C)VV, and (C)(A)V:, where A can be [j] or [w].