Good, but not great.
Well, good ol' game critizism is back.
I wont stop with saying "graphics are great" "sound fits" or sth like that in long words. The presentation is good, it does the job, doesnt annoy to much and thats all it has to do.
However, gameplaywise, there are some quirks.
At first, like other mentioned, the AI is just way to slow. WAAAAAY to slow. I just startet my usual speedrun-mentality, created like 5 supply drones and yanked out silo drones. With like 2 of those, you can just fly to the enemy, send 2 or 3 volleys of missles through their workers - er, supply drone - and their army and BAM. Enemies dead, that Mothership is no problem to kill.
So, make the computer faster (in doubt, make him cheat / start with lots of units (yeah, yeah, I know, cheating AIs suck, but making a good non-cheating AI in Actionscript? euuhhh.... fast? what? fast, too? omg.)).
Furthermore, I would like to be able to build new unit production centers, and new research centers and such things. Atm, it was mostly like an arcade game, because I just had to remember the build times and click the next drones just the second the last one finishes. (well, ok. the second the buttons reactivate.). So, I want more strategy in there. :) (In the current state, I didnt bother to research those upgrades. The economy-upgrade costs too much, 5 drones do the same thing faster. Those attack-defense-whatever upgrades? Nah. 2 more silos kill the enemy.)
But yes, if you consider such things, I look foward to a second version. :)
(and btw: I WANT TURRETS! :P I want to tower-rush the AI dead!)