How growth works in Mycelarium

In Mycelarium you spread mycelium through the soil from a single mushroom. Steam says you aim new growth with a slingshot-style control, collect underground food pockets and connect to water reservoirs, while hard soil and impassable stone shape where you can go in an endless procedural underground.

Mycelarium screenshot: a thread being aimed toward water pockets.
Official Steam screenshot: a thread being aimed toward water pockets.
Underground featureRole, per Steam
Food pocketsCollect for resources
Water reservoirsConnect to them
Hard soilHarder to grow through
Impassable stoneBlocks growth
Procedural worldEndless underground
Mycelarium screenshot: mycelium threads under a pixel-art forest.
Official Steam screenshot: mycelium threads under a pixel-art forest.

The game has no hard fail state, so you can play at your own pace.