Just played a game against the computer on easy.
Fun game, but there are some annoyances.
The computer likes to run from me, and I don't know how to stop them. They'll sit around at the edge of the planet's gravity well and when I jump in, they'd jump to the planet I just came from. When I jump back, they jump back to the previous planet. I don't know how stop them besides colonizing the middle planets and get the specific tech that prevents them from leaving your system. It's a good tactic since their army was smaller than mine, but it was so annoying. On top of this annoyance, I started getting fustrated because I would try to set up a blockade against the pirates, but the pirates rushed right by my armada, so now I'm hopping upwards to 3 planets backwards (towards my base). The only time I can actually fight them is when they stop to attack my base.
I also found a bug where my ships would appear in seemingly random places after they'd warp in from another planet. Here's an image:
http://img170.imageshack.us/img170/2489/wtfsk4.jpg
Hopefully an update or expansion comes out that gives us more different modes of play. I crushed the computer's capital and surrendered after. I took out their main base and figured I basically won. Their other bases were pretty empty and only were only there to gather resources.
It's a fun game. I've been playing it at a friend's house. I'm going to buy it tomorrow after I run some errands.