Low-Orbit Postman

You deliver mail to people who live on small, hand-sized moons. Each moon has its own gravity, so jumping too hard sends you into orbit around the next one. Learning to slingshot between moons with a parcel under your arm is the core of the game. Customers are delightfully odd: a lighthouse keeper, a lonely astronomer, a moon that is actually a sleeping whale.

The art is soft pastel blue and lilac, with planets that look like toys. The demo has one solar system; the full game has five and lasts around 7 hours. Ideal for players who like gentle physics and exploration. The caveat: the camera can be disorienting, and motion-sensitive players should lower the rotation speed in settings.