An interesting experiment...
I grew up playing Doom and Quake on the PC; so this brings back some pleasant memories of those times.
For a Doom spin-off it's not bad. The only real complaints I have is the lack of variety in the pigs - different colors does not do it - and the controls.
I liked how you merged, in certain levels, both Doom and Quake elements. It created a unique look to the game.