Oealu is my largest language yet. It has a website you can see here http://www.angelfire.com/oealu/home.html
I've borrowed the grammar from the Uralic languages such as Estonian and Finnish, and some of the vocabulary from Hawaiian. Here are just a few things about the language. Much, much more information is available on the website:

Alphabet

A Å D E H I J K Ǩ L Ļ M N O P R S T U V Y Ƶ Ʒ Ǯ

Pronouns

I=Pa
Me=På
You=Sa, Så
He, She= Ha
Him, Her= Hå
We= Na
Us= Nå
You(pl)= Ta, Tå
They= Ma
Them= Må

Cases

Nominative -a
Accusative -å
Genitive -asa
Illative -alta
Inessive -alu
Allative -alta
Elative -ahu
Adessive -ala
Ablative -ara
Supressive -uva
Subessive -una
Essive -aʒa
Comitative -uo

Numbers
1 = Ykasa
2 = Kasa
3 = Koluma
4 = Neļa
5 = Veisa
6 = kuoƶa
7 = seisama
8 = kadeksa
9 = Ydeksa
10 = Poia
100 = Raha
1 000 = Hisuona
10 000 = Poiahisuonan
100 000 = Rahahisuonan
1 000 000 = Miļuona
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Are these really cases or--as is the case with the Uralic languages--are most of them just attached postpositions? I couldn't find any examples of attributive adjectives on your website so I don't know if there's any congruence.

I suppose you could consider some of these postpositions, and yes, this language is related to the Uralic group, but there are actuall postpositions in the language. They come after nouns and the nouns take the genitive case. There is a paper Ihave written it is on the Home page under the News section and it mentions this. I hope that helps

What News section?

Here:
http://www.angelfire.com/oealu/oealu-typo.pdf

Thanks, but it still doesn't answer the question. Could you take a phrase like "this little red house" and show me how it is declined in all cases?

Alright;

kyko = this
little = toiki
red/orange = puhi
house = talona

This little red house...(verb). = Kyko toiki puhi no talona...(verb).
(Verb)...this little red house. = (Verb)... kyko toiki puhi no talonå.
Of this litttle red house = Kyko toiki puhi no talonasa
To/into this little red house = Kyko toiki puhi no talonalta
In this little red house = Kyko toiki puhi no talonalu
Out of this little red house = Kyko toiki puhi no talonahu
Near this little red house = Kyko toiki puhi no talonala
From this little red house = Kyko toiki puhi no talonara
Above this little red house = Kyko toiki puhi no talonuva
Under this little red house = Kyko toiki puhi no talonuna
With this little red house = Kyko toiki puhi no talonuo

Thanks! That does answer my question. There's no congruence, so they're not really "cases" like in the Uralic languages. More like cliticised postpositions. (Cf. Finnish tämässä pienessä punaisessa talossa, where the inessive ending is added to each constituent in the noun phrase.)

I suppose I didnt want to make this language completely Uralicized, I also added some elements of hawaiian into it and didnt want to make the words to long.