If the battle becomes a stalemate, and you can’t get higher tier units, what else can be done would be improving the existing troops.
Here are my ideas - Why not implement some research elements into this game.
- Armour Piercer Rounds
All units that uses machine gun and infantries deals extra damage on armoured units.
Infantries may attack using grenades by chance. Splash damage.
Infantries throws grenades more frequently.
- Sloped Armour
Armoured units has extra hitpoints.
- Highly Explosive Shells
Artilleries and tanks deals higher damage.
- Mobile Tactics
All land troops moves faster.
- Improved Jet Engine
All air troops moves faster. Increases dodge chance.
- Second Generation Rifled Barrel
Physical projectile damage increases.
- Airblast Drill
Mining operations yields more ores.
- Stealth Coat Buffer Layer
Anti-stealth radars won’t reveal stealth units immediately. Revealing your stealth units will take 3 seconds.
- Compound Concrete
Increases hitpoints of building and fortifications.