I Hell_goblin this game from the original Altered Sc.
Differences:
Only 1 area for all players to get heros.
Not every unit has a hero counter-part.
The area to trade units for heros is guarded by a comp.
6 Units = 2 Heros
Some units give normal units at he cost of 4 Units such as valks, corasairs, and scourge.
Each race has 1 Super Hero at the price of 8 heros.