For one, tabletop gaming has a much smaller following compared to computer games. Those that do play tabletop games are probably really invested in that type of game and are looking only for the very best experiences. Even a board game like Axis and Allies is a bit of a learning curve even for a casual gamer. That's why people that do take a break from computer games opt for card games or games like Munchkin -- games where the instructions can fit on one or two pages. Any more than that and you're drastically narrowing your potential audience.
Looking at your game page, it's easy to see the style you're going for, but I think what most people are going to want to see are how it's actually played. Does it use a board? Dice? Cards? Figurines? I would recommend making a Youtube video of people actually playing it and post that to the game page.