This is a few years old, but it was just brought back to mind, and I thought I'd share it here. This has gone years without an update, but I heard the dev is now working on it some more, and there should be another update coming up.
Wolfenstein 3D [fv11 fixed] (SEGA Genesis/MegaDrive)
Here's a port of Wolfenstein for the SEGA Genesis/MegaDrive, by GASEGA68K, written in ASM. It's mostly based on the source code of Wolfenstein 3D for PC.
It looks and plays true to the original, and is an impressive technical achievement (particularly considering the hardware).
Tested and running perfectly on MD.emu and RetroArch on Android (Genesis Plus GX and PicoDrive cores), as well as KEGA Fusion on PC and PicoDrive on PSP.