Looks like NK's pulling a SimCity here with the server problems. Storing everything server-side with a single player game is just asking for this kind of trouble.
Protips: Laser core, dart arms. Max these first; they fire uber fast and thus make better use of Research benefits. Focus on specific weapon types and don't waste blops trying out different weapons until you're past 4-5. Farm blops on 3-5. Change the game's quality by right clicking during the ninjakiwi intro immediately after the game loads.
The Kongregate fighter wrecks everything. Pump up the rail storm, and you've got an AoE weapon that reaches across almost the whole field and kills most things in one hit.
You can do unlimited training between races by going back to the menu after running out of money. When you hit continue, you'll have the stat points you've gained, but also your money back.
Great game. I found a possible bug, though: the Reflector Shield Generator still allows some damage to leak through from ranged attacks. This is especially apparent in the later stages of the Survival mission, where there's sometimes 5 or 6 laser-firing bots coming down a lane.
Encountered an awful bug after I'd finished the "main" campaign. I was killing ships in the deadzone above Haven 2 to get parts, and at some point the yard stopped working. I'd hit "yes, reconfigure", and the configure screen would come up, but the original dialog box wouldn't close by itself and there were no parts in the yard.