Demo warns you up front that it's spying on you. That's certainly better than most software, which spies on you without telling you about it. Still, this offers no option to opt out or turn off analytics in settings.

That's the demo. I'd hope that the full game is better about this but I'm not going to pay money to find out.

Yah i saw that i kinda wonder how to disable.
I understand that it's for the "in development" stage,
a easier way to track bugs and have a complete report of crashs.

But the plus side of GOG is that i can have the game run while i'm disconnected,
It kinda stalls on game launch and at close, but that could be just my computer.

I will buy it, but maybe in a couple of days,
hoping this will become my next Slay the Spire.

I can confirm that the full release v1.0.24 does allow you to opt out of the analytics.

When you load the game, you're given the option to Accept or Decline sending anonymous data/statistics. Declining doesn't seem to affect anything feature or gameplay wise.