Liked it...but I have some suggestions
This is INDEED the best defense game on Newgrounds so far..yet here are my suggestions for it.
Add different difficulties of easy, medium, and hard {hard being this version :p} just like in your other FA4.
You earn to little money, maybe add an extra $5 - $10 per unit.
The terran lvl 2, and seige tanks have to many hp. Reduce it by about 100 MAYBE 50, yet I would like to see 150 less.
Increase the mp regeneration level, it regenerates WAY to slow.
Have a building that automatically detects ghosts and wraiths so you don't have to concentrate on two parts of the screen at the same time. Also, have the defense buildings shoot behind them incase a ghost is there.
Have quick buttons so it is easier to navigate. For example: o for overlord q for queen b for build u for upgrade etc.
Have more starting money...like $400 instead of $350.
Reduce the recharge time of the defiler. Also, it gets killed by a seige tank in one hit. Also, why can't you have two or more defilers? O.o
Have the option to build units like zerglings, hydralisks, etc. Maybe to much? I don't know, just suggestions.
But the main ones I REALLY would like to see is the mp regeneration rate increased, and a building that automatically detects cloaked units so you don't have to use your spell {or whatever} to find it and then die when it's to late.
:p
Good job!!
^.^