Light pollution has been an environmental concern in Jakarta and surrounding cities. Despite the negative consequences, Jakarta residents have low to non-existent awareness about light pollution. To raise awareness, the development of an informative mobile game with the title MA’LAM is proposed. As one means to develop an ideal gaming experience, User Interface (UI) needs to be developed with usability and aesthetic approach. To implement UI design successfully, a suitable user-centric design method is required. Therefore, Design Thinking was used to develop MA’LAM’s UI design as part of User Experience (UX) development process. With a usable and aesthetically pleasing UI, message and information about light pollution could be conveyed through a positive gameplay interaction.