Designing a game with a focus on creating a happy and relaxed atmosphere is a wonderful idea. Consider incorporating soothing visuals, calming music, and light-hearted game mechanics that encourage relaxation and positivity. You could look into genres like casual games, puzzle games, or life simulation games for inspiration.
Can't kill anybody
By avoiding violence and promoting non-violent game mechanics, you'll make your game more accessible to a wider audience, including younger players and those who prefer non-violent games. To achieve this, you can create gameplay that revolves around cooperation, problem-solving, and exploration, rather than combat.
Social Issues
Integrating social issues into your game can provide players with a deeper understanding of real-world problems and foster empathy. Be sure to approach these topics thoughtfully and respectfully, presenting various perspectives and encouraging critical thinking. You could develop a narrative-driven game that tackles social issues through storytelling or create a simulation game where players can experience the challenges faced by different groups in society.