I FREAKING LOVE Enemy Zero (and just about every Warp game)!!! It was a VERY intense experience.
I remember the first time I played it and everything was going smooth and then I heard "PING"! My heart skipped a beat. "PING PING" My hands started sweating. "PING PING PING" My heart was racing and I started to run away but got disoriented and lost in a maze of crates, boxes, shelves and the like.
The save/load and weapons system as well as the enemies only being detectable by audio made for a very scary game.
But the first game to ever make me jump would be D. Imagine that... another Warp game.My buddy bought it new with his Saturn and along with me and another friend, we crammed in front of the TV. The lights were off and we were the only ones home. Then we opened the door on the staircase (Yeah... that door) and all 3 of us jumped and shouted.