It's Doom on the GBA! And it's totally broken!
I'm still over memory budget on most levels, we're tight on IWRAM so it's probably trashing the stack.
It runs at about 3fps. There's no sound, no music and the controls are just d-pad, shoot, open.
I've not run it on a real GBA yet so there are probably other bugs that only surface on a real device.
This rom has the shareware wad embedded.