For anyone that has access to his newest build, his twitter has an optional update, that he posted a few days ago, that makes the Inn a place you can walk around in, as well as a cat NPC in your room that serves as a tutorial battle. To access this, it's recommended you start a new game. The cat will transform into a catgirl, and just does basic attacks with no animations, although he may add some later. You also aren't forced to fight Shisen immediately, you gain access to all four locations when you choose to leave the Inn. Bokoさん also said that his workflow right now is: First half of the month - GBH; Second half of the month - UFG2.
This means we can look forward to some playable GBH content pretty early on in the month, after which he'll be working on completing UFG2, although there is no estimated release date yet. It's likely still in the early stages.