Very good game. BUT! If you lost the most of your FPS from one session to another, restart your computer. Yeah, thank you Windows to be so messy and so badly optimized to working fine... !
I kept my old review below, to describe how what it is to live a disappointment when you discover this very good game because unplayable because of your OS.

OLD REVIEW:
I don't know what happened. First time I played, I was not thinking that I could set a bad rating to this game. I played 2 times, than, an update. I'm to 10-15 FPS with my RTX 3060 ti, before I was to 60+ fps... What is happening?

Yeah, it's free, I understand that. But please, make a game only if you want it to be played. A game that ask for a 4000 serie, okey, but make better graphics, better animations, better details. If you really want to make a game, just make it playable, free or paid.