I don't really like Twine. I've played far too many Twine games about people's feelings. This one is about the first level in DOOM.
BEFORE YOU START - you will need a DICE and probably a PEN AND PAPER.
ROLL the dice. Whatever the number, add four and that's your HP. WRITE IT DOWN.
To FIGHT, roll the dice once for you and once for your enemy. Highest number wins and you deduct ONE HP from the loser. Keep going until it has depleted. You're probably not going to do this, but it is there if you want an actual challenge!
(See if you can get the 100% Kills, 100% Secrets and PAR TIME endings. Also, for full effect, play the below video at the same time.)