It was a space-themed 32(?) level megawad. First level starts you on a straight path approaching a huge base underlooking a black starry sky. Tons of monsters inside. I'm talking slaughter-level quantities. Again, space themed. Lots of greys and monitors and whatnot. Some secrets would let you get on the roof for powerups. A part of the level was a massive twisting dark sparsely-lit corridor with all manner of monsters, including arachnatrons, mancubi, and hell knights. Certain levels were small mini-levels where you'd just go through a familiar small area (these were repeated a few times with minor changes) and just go through a teleporter. I wish I could remember more details other than the massive first level and the repeating mini-teleporter levels, but that's about it. If anyone could help me out, I'd appreciate it.