Though we have a playable pre-alpha (See the Square Enix Collective report for more details) We are not making it publicly available, for now. We want to add more polish, re-do the animation and make everything shiny before we release it out into the wild. But you will get to play the game early. All backers with [ Access Pack ] tier and above will have closed beta access to the first chapter in early 2016.
Yes, you're welcome to. As an [ Access Pack ] backer you'll be able to play and create content based on Tokyo Dark long before the game is publicly available. Only [ Access Pack ] backers and above will be able to create let's play videos before the game is publicly released.
No, many of our backer rewards (including physical rewards) will be sent out shortly after the Kickstarter ends. Backers with [ Access Pack ] tier and above will have access to our development forum. We want to involve our backers as much as possible. You'll get to see new art as it's created, offer your suggestions and feedback to the team and play a closed beta long before the game is publicly available.