The game has four levels and constantly scrolls, requiring the player(s) to always be moving or get trapped and die. Player One always plays as Yuri, if the game is being played two-player then Player Two, obviously, is Kei.
This is the original cover for the game.
Here we see Chief Gooley briefing the Pair. Rather interesting considering the movie was the one time we never actually saw Gooley appear.
The player always has to keep running to survive.
In two-player mode players play together simultaneously.
Here are a couple of links. I haven't tried these myself; I'm not positive if they work. Download at your own risk.