What was your first impression when you played Descent by Parallax Software?
Descent (1995) was an incredible game for its time, introducing a world-first feature: six degrees of freedom. No other game before allowed such complete movement control, though it came at a cost - at least for me - inducing vertigo if you were prone to it. I'm only half-joking but playing Descent those first couple of times was both amazing and genuinely nauseating.
Flying through mineshafts, turning left/right, up/down, and doing full 360-degree rolls was all part of the charm, but the side effects were very real.
People often talk about Duke Nukem 3D, Doom, Quake, Half-Life, and Unreal when discussing 90s shooters, yet one game that introduced a truly novel concept is often overlooked among the classics. Remember, this was 1995 - nothing like it had been done before - and it came from an unknown developer (Parallax Software's first game), which makes it even more impressive.