This game is an unlicensed version of Doom (1993).
Gloom 3 (AKA Ultimate Gloom, AKA Gloom 3 : Zombie Edition) is a 1997 computer game for the Amiga computer.
Gloom 3 was the third proper, commercially released, clone of the immensely popular first person shooter Doom in the Gloom series on the Amiga.
Gloom 3's author was proprietor of Alpha Software, Gareth Murfin, with additional graphics by James Caygill and Jason Jordache
The game was one of two games produced by Alpha Software for the Amiga, the other being Zombie Massacre, at a time when the machine was being squeezed out of the market. Although the game was critically received by publications such as CU Amiga, games for the Amiga were on the decline and were not deemed commercially viable, and the game received criticism for its appearance.
Source: Wikipedia, "Gloom 3", available under the CC-BY-SA License.