Add multiplayer support with cooperational campaign or VS. mode
As we announced yesterday on our Facebook page, we are starting multiplayer feature this week! Follow us on Facebook to know news as we progress.
Legendary Heroes Team
But on top of this, the important part is that people don't just want to control 3 heroes during multiplayer. Co-op play of 3 players vs 3 players if possible would be the goal for people. Larger maps of 5v5 is where things are most applicable.
Another issue is hero leveling during the period. Having level 30 heroes and going online only to stomp low level players down wouldn't be as fun, same with starting at level 30, which is why many people would look for a system where online play you start a match at level 1 and progress during it. Levels resetting each match. There could be rewards for winning though.
Matheus Immer commented
Yes, and it could happen via wi fi, closed or public games, or Bluetooth.