Cataclysm, has a deeper meaning and story behind it, the hell style of the level means it takes place well, in hell, the ufo part, has satanic looking structures, giving another hint that this takes place in hell, now, the name cataclysm means the player died because of a cataclysm and is now in hell for starting the cataclysm, the song name, at the speed of light, means that the player is trying to get out of hell at the speed of light, and when he does, he is free from hell, but he goes straight to the next level of the trilogy, Bloodbath, the name bloodbath means that there is now a bloodbath of peoples blood from the aftermath of the cataclysm that happend, he is still in hell though, and as the song speeds up, he is trying to get out of hell quicker and quicker because the player is scared of hell, when he escapes the bloodbath though, he goes in the next level, Aftermath, the name aftermath means that this is the aftermath of the bloodbath/cataclysm, and now the song is really fast because he is scared by a longshot and wants to get out even more, and the tight corridor at about 50% means that he is in the tight corridors of hell, and is basically going through a tunnel to get out, when the song goes slow again, he has realized he made it out, and is ready to go to heaven.