Make a multiplayer version! for the multiplayer one you would need to make the map 3 times as big. have no story ,so it would be nonstop combat. and your character would save.
ok the real big two thing that need to be fixed to make this a 5, difficulty and tax, tax increases each round and quickly gets to the point where your making no money at all
thor you make a good point, i noticed that to, it took away A LOT of cash from tax each round. after round ten I was making barely any money,also because of having to repair and buy grenades,hammers,and mercenarys