Oh, where the wild things are.

There's a bug currently where some players can crash after the final boss fight during the cutscene and the game becomes unplayable after that.

Starting the game back up, it will try and load and then you'll crash. Currently there's no way to fix it and it will ruin your save and you'll have to start all over.

To be safe, go to your Steam folder and back up your userdata folder so that, if this does happen, you can replace your save and at least play before the fight for now.

I didn't run into the bug, personally, but It's been happening a lot to people.

Happy hunting!