How is Tomorrowtron 2.0 supposed to be even remotely fucking possible?

Idk if I'm getting bad luck or not, but Far Future Day 35 feels like the most agitating expansion boss fight in the game so far. The plants you're given for offense are dogshit, Zomboss literally spams his missiles and charge attack every two seconds, and when he's not nuking your defenses, he's spawning in like five mechs and ten jetpack zombies. I genuinely am resorting to money farming just to get power-ups to have a REMOTE chance against him.