So I thought of this suggestions mind to take of a few minutes to read it?
-New Wall
>Heaven's Gate
Health: 200,000
Abilities: Boosts the effect of the return damage upgrade, and has a chance to repel all damage given
Cost: 4 gold and 800 lumber
More details: It comes after the God's Seal Wall
-New Buildings and Towers
>Mana pool
Health: 5,000
Abilities: Regenerates nearby units 1 mana per second (300 AOE)
Cost: Free
More details: Can be upgrade for higher regeneration rate
>Death Tower
Health: 4,000
Abilities: Has 10% chance to instantly kill a unit (does not work on bosses)
Damage: 40-68 Chaos Damage (lvl 1)
Cost: Free
More details: Can be upgraded for further increase of damage ( The ability will only work if the "Magic" upgrade is researched)
>Slow Slate
Health: 2,000
Abilities: Slows all nearby enemy units by 10% (675 AOE)
Cost:400 lumber
More details: Can be bought at the Item Vendor
>Survival Bookshelf
Health: 3,000
Cost: Free
More details: Same as the bookshelf but this will contain books like "Hitman Training" (It further upgrades the damage of your heroes)
(94% chance of finding rubbish, 6% chance of finding survival books)
-New Units
For the survivors
>Lt. Rexxar
Health: 35,000
Abilities: Endurance Aura, Summon Critter (Randomly summons a critter for aid in battle and will last about 60 seconds), Roar (Boosts Damage of nearby units 50% but it does not affect heroes)
Cost: 3 gold 200 lumber
More details: Can be bought at the Mercenary HQ
>Sorceress
Health:4,000
Abilities: Fork lightning (deals 5,000 ti 3 units), Flame Strike ( Ignites 475 AOE 1500 damage per second and lasts about 3 seconds),
Chain lightning (Deals 15,000 damage and can bounce about 3 units but every bounce reduces the damage by 4,500)
More details: Can be bought at the Mercenary HQ
For the Unknown Attackers
Kotetsu
Health: Depends on what mode you are playing (eg 10,000 health on very easy mode)
Damage: Depends on what mode you are playing (eg 3000-4567 chaos damage on very easy mode)
More details: It attacks and looks like the Blademaster and it spawns the same time as the zonics spawn)
And may I also suggest that you make more base camps?