There is currently a random map generator, but there isn't a large number of pre-made maps (actually not any in the current alpha state). Many games do have pre-made maps that the end player can play on for a certain experience. Examples include a historic story map, a map with certain conditions (ex: perfectly equal tournaments), or that force a certain playstyle. If multiplayer is ever introduced for example, a perfectly symmetrical map would be in demand, as multiplayer requires competitive play. Do you think that ISG needs some pre-made maps? Another option is to release a map editor for players to play around with and make their own maps. For Steam, this could be integrated with their workshop, where users can subscribe to other people's maps.