Hi esiecia,
Good news, I just pushed an update that makes this easy. Here's how to carry your guild across:
On the original PC: open ⚙ Settings → "Back up save". It downloads a small save file. Copy that file to your other PC.
On your other PC: open the game and, on the opening screen (the closed ledger), click "Continue from a backup file" at the bottom, then pick the save file you copied over. Your dynasty will load right up.
Just make sure both are running the latest version. One heads-up: saves live in the browser on each device, so it's always worth keeping a backup file, that's your insurance if a browser cache ever gets cleared. Enjoy, and thanks for playing!
If I ever port this to Steam ( A very long term plan then Cloud support would be a given) for Itch if this ends up having a lot more players I'd set up a small server but currently I'm still trying to build this out and see if I can get an active player base so hopefully the solution above helps you in the here and now.