I have full IPv6, none of my ports that I haven’t explicitly whitelisted in the firewall can be accessed from the Internet. I can open a host completely, but it’s not default. This is on the most common brand of consumer routers here.
Just because it’s not NATted doesn’t mean there’s no firewall in place.
I’ve played the game shortly hoping for it to be a mix between Isaac and Noita. However, the game failed to grab my attention for longer, as the wand building mechanic is way inferior to Noita, though the custom wand properties sure are nice, and remaining loadout and options were worse than what I remember from Isaac.
All this doesn’t obviously mean the game is bad, apart from maybe the cringe story. However, measured against the giants - I’d also include Enter the Dungeon here for presentation - it currently falls short.