If this is what was before narvas 13 I have to try it and see the differences in them, I didn't play the GBC version of metal gear though so I'm not familiar with that. But maybe you can look at the gbc version of MG and try to imitate the color palette, so it looks similar.
As for the AI I can suggest an alternative if you don't wanna get your hands dirty with a path system, something easy:
Make several 'waypoint' objects, players can move towards these objects. Connect all the waypoints to each other, so each waypoint will know the neighbor waypoints. And then you can assign each waypoint a chance to make the player move to a neighbour. A 90% chance to move to a next neighbor forward, and 10% back, in a square-ish pattern would sometimes make the one following that square path turn back as a surprise element.
This would require no paths and you can place them anywhere you want, this is of course if you don't want to use paths, in case you want to make a patrol system with paths that would be better.
Edited by kangaroodev, 21 February 2016 - 01:23 AM.