DOOM v1.2 shareware DEMO1
Released February 17, 1994. You can see how much more familiar with E1M2 Romero had become from his earlier attempts, quite a lot of shots get taken while he's still running around corners. After taking the chainsaw he opts to finish the level with practically no other weapon, which is pretty hilarious.
Demo captured from the original .exe using Dosbox 0.72.