Fun, fun, fun! With Doom style textures it felt homely. I wouldn't try to make this home though, you get killed for standing still for long. Play flows well, except for occasionally getting stuck on steps. The layout is made up of 3 levels spread though 3 main areas. Lighting is all sourced, nothing fancy. The level doesn't look very detailed, mostly flat wall surfaces.
Teleporters break up movement in the level. It stops you from circling the level. No problems with ammo or health, just a few silly things lower the score.