You race through a 3D maze of the same type as Wolfenstein 3D you race through the maze as the timer counts down, picking up cat paws to finish the level. Flags also appear, and grant extra time. As time is very short, so they pretty much dictate what path you must take. Irritiatingly, the death sound loops over and over unless you reboot the game.
I'm not sure why this is called SeeNa 2. The original SeeNa came out for the PC-8801 and was made by System Soft, not Bio 100%. It appears to be a maze crawl as well, but more of a sci-fi shooter than SeeNa 2. Bio 100%'s website has some game play movies and many more screenshots.