Amazingly addictive
This game was outstanding to play, and I only have a few suggestions to make it better.
For one, I'm probably the only one so far to 'complain' about not having enough upgrades (As the current high score holder, once you get past 18000 kills or so, you have enough kg's to buy everything, if you did everything in a proper way). In the end though, I could only go one level after having maxed all the upgrades, so I wouldn't have been able to afford another one anyways.
For those who want to know what I did to get that far, I first upgraded the weapon and turret alternatingly, upgrading nothing else (except getting the cart boy ASAP) until both were fully done, except for maybe 1 hull, and 1 mag field upgrade. After that, I upgraded the mag field to the point where it starts costing $250000 and get a hull upgrade or two, then keep upgrading mag field until its done (last one will be $350000), then upgrade the hull completely after. You may still need to replay a few levels, but eventually, you can get to the point past all the upgrades.
Back to the review: The second thing I think should be added, is maybe having more specific upgrades, like "Improve Thor gun arc distance" or something like that. Also, I think more guns should be added too, because the most expensive one is only $150000, whereas the most expensive upgrades for the hull and mag field are $300000, and $350000.
But overall, this game is epic; I expect to see it on the front page very soon, once more people start to play it, and see how awesome it is.