MaxEd, the famous creator of GZDoomBuilder seems to be a mapper and modder as well, as he has just released another public test version of his Re-Exhumed. It is his attempt at recreating a 1996 FPS PC game known as Powerslave in America, Exhumed in Europe and Seireki 1999: Pharaoh no Fukkatsu in Japan. It includes several enhancements like better enemy behavious, new music, widescreen-friendlieness and more nifty stuff that hasn't been in the PC version before. A playable demo can be downloaded in the official thread, other than that I totally encourage you to test it and give MaxEd some feedback, it's definitely worth playing!