i hated it
i doubt you read this. but my god, way to "slow" as you said at the begining, then it just got fun for awhile till about level 30, then i sat for 20 levels, while my base was able to kill everything, it was an ok game, but im sure if i tried, i could find a way, to make it, so after like level 20 i wouldent have to lift a finger.
long story short. don't waste your time playing past level 30 or so, after you get the current "spawn " under control, there seems to be no point in playing past that point.