hmmmmm...
the music from start is from the start menu(from DOOM 3),and also when U killed CyberDemon,He died in the same way as it did in DOOM 3(at final that wepon gets around for a waile and then it cuts him up)
...It was like you recreeated the new version in badass oldshcool,respect for tht!
But at the final you ain`t get to shores of hell(final of DOOM 3),as you do in the old version,atcully the marine reinfocrements come to Mars,Find you and bring U back home.Story is kinda edited but I love it!