Nice video! Well presented and thankfully on peertube. It's a bummer you could only get the DOS version going.
Moving forward with the spacebar seems so silly when the up arrow is right there, but like you said this was early days. So many early 3D games tried to reinvent the wheel, it's almost a wonder that the industry finally sort of standardized eventually. Even up through some PS2 games cameras and 3D movement were weird.