I think your gray box model was built very well, the light navigation bar with dark text is simple and clear, and does not block the game scene at all, in line with the minimalist style. By trying it out, I get clear interactive feedback. But I think you can also improve the color collocation, the buttons can be set to similar colors, so that more attractive and not obtrusive. The overlap in the background design is somewhat obvious. But overall it was a good game and I enjoyed it very much.