Just throwing out ideas and see what sticks. :P
Maybe if you like part, but don't like S4/5 idea, put them in S3 or whatever.
Stage 4, 5:
Aliens:
Advanced Dretch (free) Stage 4
45 hp, stage 4
Can turn semi-invisible for 30 seconds every so often.
Advanced Tyrant (7 evo) Stage 5
650 hp, stage 5
Does more damage, has single or double regen field.
Alien Buildables:
Goop (4 BP) Stage 4
150 HP
Goop is built from the ceiling, hangs down and obscures view.
Shrine (12 BP) Stage 4
200 HP
Reduces damage aliens and buildings take for a large radius.
Spire (12 BP) Stage 5
300 HP
Shoots poisonous needles, long range. Similar to human's turret.
Weapons:
Landmine ($500) Stage 4
Explodes if an alien steps on it.
Railgun ($1200) Stage 5
Like the mass driver, but does 3x as much damage, and goes through any target, hitting any behind. Impact with a wall causes a small splash area. Should take longer between shots. Should create a visible trail (but the projectile is hitscan).
Human Buildables
Minirocket Battery (12 BP) Stage 4
Mini rockets, slow but destructive.
Force-field Generator (16 BP) Stage 5
200 HP
Aliens within the force-field area take damage. Stops projectiles.
Just throwing out ideas and see what sticks. :P Maybe if you like part, but don't like S4/5 idea, put them in S3 or whatever.
Stage 4, 5:
Aliens: Advanced Dretch (free) Stage 4 45 hp, stage 4 Can turn semi-invisible for 30 seconds every so often. Advanced Tyrant (7 evo) Stage 5 650 hp, stage 5 Does more damage, has single or double regen field.
Alien Buildables: Goop (4 BP) Stage 4 150 HP Goop is built from the ceiling, hangs down and obscures view. Shrine (12 BP) Stage 4 200 HP Reduces damage aliens and buildings take for a large radius. Spire (12 BP) Stage 5 300 HP Shoots poisonous needles, long range. Similar to human's turret.
Weapons: Landmine ($500) Stage 4 Explodes if an alien steps on it. Railgun ($1200) Stage 5 Like the mass driver, but does 3x as much damage, and goes through any target, hitting any behind. Impact with a wall causes a small splash area. Should take longer between shots. Should create a visible trail (but the projectile is hitscan).
Human Buildables Minirocket Battery (12 BP) Stage 4 Mini rockets, slow but destructive. Force-field Generator (16 BP) Stage 5 200 HP Aliens within the force-field area take damage. Stops projectiles.