Side Scrolling RTS Idea

Have you ever played dota or gauntlet legends? I am to toying with the idea of doing something like that for the android platform. Imagine you have a 2D side scrolling map that you can go back and forth(not on rails). You have two sides, team west and team east. Each side will spawn characters that would head out to meet each other in battle. There will be towers to defend each team. The goal is to use a hero to turn the tides of battle. This is assuming that if you left the spawned characters to fight it would be a stalemate. However, this sounds just like dota/league of legends/heroes of newerth. I am not sure if changing it to 2D is enough or how many changes it would take to make it something different. I like this idea because it would be portable (phone), shorter game length, and less complicated to start playing. Now some problems could include multiplayer, AI, and combat. Please let me know what you think!