Vaporum

Vaporum is a grid-based, single-player & single-character dungeon crawler RPG seen from the first person perspective in an original steampunk setting. Inspired by old-school games like Dungeon Master I and II, the Eye of the Beholder series, and the most recent Legend of Grimrock I and II. Stranded in the middle of an ocean, in front of a gigantic tower, the hero has to find out what the place is, what happened there, and most importantly, who he is. (mobygames.com)