Still say you need another planet, but feel free to ignore this (you'll probably have more in the "finished" skirmish mode right?)
When I select a carrier and build a wave, it deselects the carrier (its annoying the hell outta me to the point where I only build carriers once in a blue moon...)
When you have 2 commercial buildings, you can research the speed to .33 and gain basically unlimited income (I tried researching to 0, and it actually slows it down... figured it'd stop working or something. I suggest making the upgrade only avaliabe to the speed of 3, so you don't get people exploiting this)
I might suggest adding some defensive weapons on the starports, so they're not completely screwed if all your units die (also adds a bit of realism to the game, starports, even civilian ones, would need something to destroy, deflect, or drag in space debris, comets, etc... or the station could be easily torn to shreads... just a suggestion)
But all and all, still an enjoyable (and time consuming...) game, I like the list system you added in, but there is one small problem with it... While playing as humans (I haven't tested the other two races since the new version), when I built a cargo ship, the list would say "you have build a (last created unit)" So, if I build a destroyer before, it'd say I build another destroyer when my cargo ship finished (this goes for both the small and the large ship)