@Whitebeast: I gave basic guide for that in response to another player somewhere before, recently. You could go check for it and up it some... so I don't have to say it over and over -_-'
Again: prioritize incoming biplanes right away, so they don't have a chance to shoot. Be aware of the hp/damage/range of all enemy units. after the biplanes, prioritize vehicles (including aerial), until the infantry come right next to you, THEN kill the infantry (since they're one hit kill)... or kill them on the way to kill other vehicles. Prioritze ground vehicles over aerial (with the exception of biplanes), except when the aerial craft get about halfway to you, then take them out (they go down easy). Oh, and make sure you hit the centre/main area of each vehicle unit.
at paloi, 4 was easy, you just need to learn to prioritize. Kill the airplanes as soon as you seem them (not the zepplins or balloons, but the actual incoming swooping planes). Try to minimize mouse movememnt as much as possibe to get everything quickly; be aware of the range on everything, and how easy they are to kill. For example; if there's a bunch of infantry outrunning tanks and walkers, kill the walkers/tanks and then kill the infantry (cuz they're one shot kill)... or kill them on the way to kill the walker/tank.
If that's how the space station was all throughout the game (at the end), then it's heavily undefended and vulnerable from the underside. Space ain't got no gravity, or any limitations as to where something can go or come from. The engineers of that station should be ashamed of their selves
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Please send me a screenshot? I'll be happy to fix any problems that I can see :)