Unintuitive physics, cheating AI.
The game was fun, for the earlier levels. They were over fast enough that I never got a chance to pick up a lot of the light and medium parts I wanted, though, and the later ones really bring out all the worst in your game - it becomes pretty much necessary to equip heavy weapons since they in general have the best defensive coverage, but the speed reduction from heavy weapons in almost all cases will actually make them objectively weaker than light or medium ones. Your damage starts to go down at that point while enemies' defenses are going up, and the matches become torturous slapfights with nobody doing more than scratching each other, and replaces the early, fast-paced combat with a boring dance of clumsy, lumbering heaps... at its -best-.
At its worst, you get ganked out of nowhere because the AI is able to turn faster than the player ever can, with zero acceleration time (On note of turning, you also have to circle the mouse -way- too tight to keep control of your own craft). This gets painfully obvious with the normally slow, lumbering heavies, where it is also most unfair - slow, predictable movements are the only way to land a shot on the ones with the narrowest weak spots. I have several times lined up a seemingly perfect shot on an enemy bot and literally fractions of a second before impact, had it instantly reverse its rotation and twist into me sometimes for enough damage to one-shot me. I've just suffered one unfair death more than I can handle and I'm putting your game down for good.