A small planet builder app. Nothing in the way of gameplay, just something to take a short break and design a cool planet. Change colors, basic features, rotation, effects, etc. The level of customization is actually not that high (example: limited to a set number of features that apply to the whole planet rather than placing them yourself, no ability to add multiple moons or customize their topography,  only one "ring" style), but it's a chill way to spend a few minutes.