Hydraulic Empire is a Tower Defense game with RPG elements focusing on strategy, interactions between mobs, and persistent upgrades. What we are doing with Hydraulic Empire is taking the best of what we have experience over the years, and then we are adding elements that are unique. Tower Defenses are not new, and they are not evolving much anymore. We aim to change that by adding in a variety of unique mob interactions. We are also adding in tons of RPG elements and we have a hero/builder that will allow you to take part in more of the battle. Mob interactions are our major innovation. Where as they are not 100% new to the tower defense genre, they are typically simple or not very interesting. We have taken this to the next level, and centered our game squarely around them. Mob interactions will take place all over a level, and will change where and how you choose to build in a level. The interactions vary greatly based on which mob die in which order. This aspect of the game has given the game almost endless replay ability. Most of our mobs will interact with at least 2 or 3 other mobs. Some interactions open up new interactions, and others will lock out some interactions. Without revealing to much, the game starts directly after a civil war between the aristocratic mages, and a Steam Punk based rebel army. The rebels have won, and the mages have dispersed. In the chaos of victory new factions have formed, and a new war has broken out in a bid for control over the newly formed country. As the Lieutenant General that who help win the final battle against the mages, you are in control of the old capital and must find out who has split from the main army, and who is still loyal to the cause.