Well, it's actually just a hardcoded slideshow of E1M1 while something vaguely approximating the main riff of At Doom's Gate plays inconsistently in the background, but you'll have to watch all 15 excruciating minutes of this poorly-narrated Youtube video I'm linking to figure that out.
I ported DOOM to it. In 100 LOC. BTW it's just a a line shooting a ball of zero width, at another line. And there's some movement left and right. But not forward, nor backwards. So there's no real strafing. And the other line doesn't shoot a ball of zero width back.
Well, it's actually just a hardcoded slideshow of E1M1 while something vaguely approximating the main riff of At Doom's Gate plays inconsistently in the background, but you'll have to watch all 15 excruciating minutes of this poorly-narrated Youtube video I'm linking to figure that out.