In case you didn't play recently, a update added 3 Golden Stars to the main menu, each having some special feature when enabled. But they must be unlocked.

The 1st Star is the one who most affects the gameplay, making grenades travel at high velocity and farther, and being able to throw many very quickly. And it's is also the easiest one to be unlocked. It can be unlocked by clicking something (no spoilers there) in the Main Menu. Meaning that it can be unlocked before talking to the Farmer, and after cleaning a save.

i think we should use it only for new game+

I'm gonna say no. I'm fine with star #2 as it's just a visual thing, but number 1 affects gameplay

yea that makes sence

Ok, thanks!