Trivia- This was actually the very first game in history to use WASD, I believe. (Even though this copy doesn't default to it, the original one did.)
I don't hear audio. Is there audio? The audio was one of the best parts of this game!
https://en.m.wikipedia.org/wiki/Arrow_keys#WASD_keys states that Wizardy (1981) used WASD first.
Pay attention to stuff like Journey, the Portal series, Limbo, Device 6, etc. -- the games that people will look back upon nostalgically when they're complaining about how games made in the 2040s lack the imagination of the games of their youth.
Maybe you could say that never so many people played so many bad games, but good games are still plentiful.
Fun fact - Jonathan Gay, the creator of Dark Castle, went on to create Flash. If you squint a bit you can see the lineage from Dark Castle leading directly to Flash.
Who's up for a game of Maze Wars?
PS: I was 9 at that time :)