Credit goes to Nexion for uncovering Spoo Strike; a mod for the Shareware version of Wolf3D with some new graphics and a new set of maps.
Spoo Strike came out in 2007 [Citation needed], made by someone called GomaSP.
GomaSP is also responsible for an untitled shareware map pack, available on their website. The website itself is in Japanese, but has screenshots so identifying the games isn’t a hassle.
Spoo Strike is now listed on the Mods Page.