I'm trying to remember an arcade game I remember seeing in the early to mid 1980s. It was a space shooting game, in which you control a space ship, which you control up and down and side to side, but motion is always "into the screen", rather like Space Harrier.
The view had the enemy ships scaling as they approached you, I think.
The ship you controlled seemed to be in some tunnels, or more appropriately named, corridors of either a large ship or space station? The corridors (in light blues and light greys) would occasionally curve. Also I recall the game was always in the corridors, there was no open space part.
I thought Astron Belt might be it, but it seems like that game is mostly in open space and the corridors are at the end. It's definitely not R-Type.