Iron Coffins? To me this name implies you're going to die in your submarine... Anyway besides that... :)
You said to judge your game on the graphics.
They're ok, outside shots - sky is quite nice but the water needs a bit of work. It just looks a bit grey. Give the sea some colour. and perhaps more detail (white water ripples) - it just seems a bit flat.
Inside shots - you could really benefit from some proper lighting, i.e. using lightmaps. I highly recommend buying Gile[s] for this, it's a really good tool (not just for lighting, but also for bringing together all your models into one scene).
You said to judge your game on the graphics.
They're ok, outside shots - sky is quite nice but the water needs a bit of work. It just looks a bit grey. Give the sea some colour. and perhaps more detail (white water ripples) - it just seems a bit flat.
Inside shots - you could really benefit from some proper lighting, i.e. using lightmaps. I highly recommend buying Gile[s] for this, it's a really good tool (not just for lighting, but also for bringing together all your models into one scene).