It needs a plot. Badly. Most Mech games have a destroied plant theme or an arena theme. How about something much better? You say it's for all ages, so that may be a tad restircting on the plot. I have a few unused ideas for a plot, but I'll prolly just make one up. But I need information as to who this game will appeal to and what level of complexity, violence, romance etc. should be included.