Yea, this is Serious Sam: The Second Encounter witb a mod called Serious Violence. Very fun to play. PM me for a link to the mod
EDIT:
Sorry, i havent been on my youtube account in like 3 months, but for all those who need it, the link to the mod is here: (fix the .com)
mz23.web.fc2. com/bd/index_eng.html