Version 0.4 has been released.
You can check it out on the Patreon page. The focus is Mai -- particularly more events surrounding her, as well as her attempts to help Bai Huan learn more about his "powers".

Features

• Upgraded the training method, you can now toggle single or cycle training.
• New training methods (Naked Sparring!)
• New options for interactions
• Improve relationships
• More fanservice scenes.
• More lewd encounters and events.
• Refined gameplay mechanics and QOL improvements.

- My Big Little Brother.