Astrophobia

In 2001, astronauts Ben Dyer (the player) and Henry Danforth are sent to the Moon as part of a secret mission, Project Kadath, to study ancient megalithic architecture far older than humanity. The civilization that built it did not survive, but something else did.

A PSX-style cosmic horror game where a classified mission to study alien architecture on the Moon leads two astronauts into the ruins of an ancient civilization that predates humanity.