Zillion 3D is a Wolfenstein 3D mod with characters from the anime Akai Koudan Zillion. Two episodes. 20 levels. 4 bosses. It’s based on Wolf4SDL, so it runs straight from Windows.
I've never played Zillion but this is a Wolf3D mod with a decent sci-fi theme, total anime feeling, good maps, and amazing graphics true to the anime feeling.
Well done in my opinion, especially loved the wall textures, a good mod with seemingly little changes to the engine. :)