I'm thinking there should be different heroes for each different person with different skills and all. Spies should be like attackers but be more of fast units so they can get out and check stuff out ex: Ling or vulture. Attackers should be like zealots, goon, hydra, high templar, dark templar, firebat. Guards should be ranged units like ghost, lurker, tank. Kings should be either ultra, rine, reaver or something else (Haven't really thought about this part xD)
Same heroes on each side should be allowed but maybe have spell picking?
Game is won when someone kills the other team's king. For healing system there should probably be healing by 1 medic so people can't spam heal. There should also be a training system to upgrade spells and attack.
I can't really make maps so if anyone wants to do this feel free to >:D any suggestions on anything else?
None.