"The Conservative" seems impossible to obtain because the enemies spam too much and there's no way you can defend the huge broad side of a barn behind you with just smashing your ship into the enemy bullets (the intended way to play it to obtain this medal).
Also it does no good whether you concentrate on eliminating enemies evenly or more on one side or the other -- fact of the matter is the enemy fire rate is too high at present for this to be possible. Or in other words prove to me that it is possible because I'm pretty sure as-is it's mathematically impossible. And no one has it, even among the greatest medal hunters on the entire site.
Change that fire rate or make it so buying health upgrades also upgrades the base's health as well as your ship's. You really shouldn't include impossible medals in games. Hard, yes. Literally impossible, no.
Also lol at everyone saying how this game is "easy" yet clearly they don't have all the medals so not so easy, then is it?