菜園惑星 -惑星でせいじんを育てよう- is a free idle game available on iPhone that invites players to develop a small planet and revive its civilization. The game features a unique storyline where players discover a neglected planet that once thrived with life, and their goal is to cultivate plants and restore the civilization of the 'せいじん'. Players can engage in simple gameplay during their free time, making it an excellent choice for casual gaming, especially during summer breaks.

In this game, players start by planting 'せいじん' seeds, which evolve through various stages: seed, sprout, seedling, flower, fruit, and finally, mature 'せいじん'. As these beings grow, they generate energy that can be utilized to cultivate gardens and enhance the planet's development. By collecting energy and leveling up the planet, players can ensure a prosperous life for the 'せいじん', increasing the energy output as the civilization flourishes.