The thing which bothered me most about breathless was the "by blocks" level design. It was, essentially, Wolfenstein 3D extended vertically. However, I recognise that this simplicity was in no small part responsible for it's speed.
Breathless was the first AGA FPS (you thought I was going to say game-that-shall-not-be-mentioned clone, didn't you?) that really demonstrated that with appropriate conversion you could have a scalable 1x1 pixelmode engine. On my 040, it was playable at a reasonable size in 1x1.
From a technical achievement perspective though, no amiga-bred FPS game comes close to the AlienBreed 3D game for me though. Pity that TKG was so rushed, it could have been so much more.
