I agree that the scope can be a little narrow when dealing with just submarines. I had some thought for submarine based puzzle games, or a VN on a submarine, but I don't think I'd have gotten those done in time. Though mostly because I had work through the whole thing. Changing it to "Aquatic Jam" or something would definitely broaden the scope. It could then have a narrower theme if you wanted, like submarines. Or you could go with a genre, but it has to be aquatic. Like "Aquatic Jam: Puzzle Games"