Will Rock

Will Rock has been described as Serious Sam set in Greece.

A budget First Person Shooter where you take the role of the title character, an archaeologist named Will Rock. Your mentor has been murdered by a cult calling themselves the Olympian Restoration Army.

This of course leads to you running around Grecian ruins shooting at hundreds of bad guys and mythological monsters. Like the aforementioned Sam, Will Rock relies more on spawning dozens of bad guys at a time and furious combat than story.