It was way ahead of its time. Having sloped floors, catwalks, transparant textures and moving platforms while still being limited by 90 degree walls. A mouse based shooting with the crosshair moving across the screen and using that same crosshair for your HUD and picking up items. (not unlike what system shock did)
And above all, it’s a lot of fun!
Here is an alternative Piped link(s): https://piped.video/8U0egQsgz2o
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I’m open-source, check me out at GitHub.