It is. It was one of the first bonafide Doom clones. Although it used a rather blocky chunky-copper-screen and looks extremely dated today, when it was released there was nothing quite like it on the Amiga. I should know, I bought every damn ego shooter at the time ;-)
In some respects it is actually more advanced than Doom was. The biggest shame was that the engine was designed to run on your basic A1200 (which it did and was for the most part playable) but not much was done to make it scale up to better hardware. So, whilst it runs very smoothly on an accelerated system, it remains just as blocky.
