Piinu

Vowels
Piinu has a height-based vowel harmony system, /i/, /iː/, /u/, and /uː/ are high, while /a/, /aː/, /ɔ/, and /ɔː/ are low. /ə/ is neutral. In borrowings, the height of the word is based off the first syllable that is either high or low, ie computer would be high, and column would be low. If all the vowels are mid, the height of the word is chosen randomly.

Phonotactics
Syllable structure is strictly CV.

V[+front] → V[+back] / C[+velar]_

ʔ → Ø / #_

V[-long] → V[+long] / [+stress]

Ø → ə / {_#, C_C}

Ø → t / {#_V, V_V}

Noun Classes
Piinu has 4 noun classes, that form an animacy hierarchy

Exalted is for Gods and cataclysmic weather events. Sentient is for adult humans. Animal is for animals, human children, and rivers, and most weather. Other is for everything else, like trees, rocks, houses, etc.

Since class is indicated on the articles and case but not the root noun, a word can be upped in animacy to indicate something, like a local ruler would be Sentient, but a president or emperor might be upped to Exalted to indicate respect. Similarly, a noun could be decreased in animacy, like "sheeple" in English, to indicate derision or youth. For example, ruuri (person) is S, but marking it down to A indicates a human child, while marking it down to O indicates a baby. Most ideas are Animal.

Case
There are 5 cases in Piinu, Nominative (NOM), used to indicate the subject of a transitive or intransitive verb; Accusative (ACC), which marks the direct object of a transitive verb; Genitive (GEN), which marks a possessor; Dative (DAT), which marks the indirect object; and Locative (LOC), which marks the noun a preposition modifies. The NOM marking is only used to indicate when a class is being changed, or if the definite article is used and the noun has a different meaning in Exalted.

Definite
There isn't a specific definite article, instead keti/co/haa'o/ruumi (this/that/yonder/these) are used. It is usually omitted, but must be used for E nouns and all names. If a word is in NOM and has a different meaning in E than it's basic class, the NOM marking  must  be used with the DEF article.

Tense
Piinu has 2 past tenses, a present, and a future. Past 1 indicates far time (dependent on context, for a country far time could be >100 years, but for a kid complaining about how last time they ate was AAAAAGES AGO far time might just mean two hours ago). Past 2 indicates any time nearer than past 1. If this needs disambiguated, a time word can be placed before the verb. A verb never appears without an aspect, and the consonant is consistent over the tense, so tense is analyzed as being CVC, and aspect as the V to complete the syllable.

Aspect
Perfective indicates an action that is performed in it's entirety

Habitual indicates an action that is performed habitually or regularly

Continuous indicates an action that is still in progress in the time frame being referenced

Mood
The realis mood indicates an action that has actually happened. It cannot occur with the future tense.

The irrealis mood indicates an action that isn't real. The future tense must take irrealis

Adjective Morphology
Piinu has mostly noun-like adjectives. They mark for the case, gender, and number of the noun they modify. Generally they are transparently modified from nouns, ie metallic (cii'ii) is cii (metal) plus -'ii/-'aa (adjectivizing derivational morpheme).

Syntax
Word order is mostly free due to cases, although in most speech the verb is always final. It can be moved elsewhere for poetic reasons, but this is uncommon.

Adjectives occur after their noun, and agree in case and gender.

Postpositions occur directly after their noun.

If a time word is present, it is placed directly before the verb.

Lexicon
I present a small selection of words here, others can be found in my lexicon.ga dictionary

Nouns
* stress induced length is not noted in the dictionary form

** ↓ indicates that the noun has another common meaning when moved down to a lower NC, ↑ indicates another meaning when moved to a higher NC