Obscure Game Aestheticsさんのイラストまとめ

Autumn Aurora 2 (2014)

Mod for S.T.A.L.K.E.R.: Shadow of Chernobyl.
Developed by Autumnal Wanderers.

Ashen Falls (project on hold)

Developed by LostatSea Games.
Concept arts by Gilles Ketting ( @GillesKetting ).

Cold Fear (2005)

Developed by Darkworks.

Also leaked concept arts, not sure if legit :

Death Crimson (1996)

Developed by Ecole.

Fragile Dreams: Farewell Ruins of the Moon (2009)

Developed by Namco and tri-Crescendo.

Ranger X (Ex-Ranza in Japan) (1993)

Developed by GAU Entertainment.

Evil Twin: Cyprien's Chronicles (2001)

Developed by In Utero.

Kuon (2004)

Developed by FromSoftware.

Cosmology of Kyoto (1993)

Developed by Softedge.