I have 1,200 bucks and died a couple of time, but it is still ridiculously easy, sorry. This is nowhere near the Impossible difficulty in SS2.
you are officially FULL OF SHIT! HOW THE FUCK do you beat the last wave in the good time club, where you at first have to fight against two turret missiles, and one walking turret missile with infinite health and then two FUCKING BALLON TURRETS at the same time as you lower the health of the walking missile turret, killing you in ONE second if you expose yourself to fire, which you will because it is impossible to find cover fucking ANYWHERE. Seriously, show me how you beat this "ridiculously easily", upload a fucking video. Or you will be forever known as a twatty liar. I've user 10 lives and have had to reload 4 times by now, doing the entire fucking longass fight over and over again, and I am FUCKING PISSED
That part was harder than previous parts, but still easy. Get to where the medkits are, sit there with the handcannon (this gun is completely overpowered) and shoot the heads of everyone who's coming. This is important since a headshot with it is lethal. Once the patriot appears, run up and down and shoot him in the back. Simple as that.
Wait until you meet the Mr. Handymen, these are challenging until you discover how to beat them super easily. They had me scratch my head for a while, which is nice.