This research explores the significance of visual elements – specifically graphics and illustrations – in serious games designed for educational purposes, targeting teenagers. The paper focuses on the applicability of design elements to enhance engagement in a game currently in development that educates about energy communities. The game, EN-JOIN, uses a text-based interface where players interact by typing answers, which are evaluated by a Large Language Model (LLM). This interactive “conversation” guides players through various levels, contributing to the storyline and educational objectives. Our approach incorporates inclusive design, emphasizing the portrayal of diverse cultures, genders, and identities. By leveraging simplified, symbolic visuals, we aim to create an engaging and empathetic experience without overwhelming players. This study addresses the challenges of balancing complexity and simplicity in visual design, ensuring that characters and scenarios are relatable yet free from stereotypes. The game aims to make players aware of their environmental impact and encourages them to engage with sustainable energy practices.