The Blob Conspiracy - FPS Radar
Developed between 2001 to 2010, The Blob Conspiracy has only recently been released on Itch "for historical purposes." Described as a "Classic FPS with some Adventure aspects," you must infiltrate a heavily fortified castle and take down your arch-nemesis, all the while dodging his relentless army who are hot on your heels.
This title has three levels to play, and is free-to-play. Chat with NPCs, loot safes, and perforate your foes with a pistol, SMG, minigun, and more.