Mycelarium has no win condition and no fail state, so "what to do next" is a question you have to answer for yourself. The game sets no end state; the official description says there is no rush and no hard fail state, only the quiet pressure to expand, adapt and connect. In the demo, the one thing you can actually finish is the upgrade tree.
Mycelarium what to do next: the demo has no win condition
Players have said it directly: I felt I did not have a goal, never really felt like I got anywhere, is the aim of the game merely to get all the unlocks. That is a fair reading of an open-ended incremental, and the honest answer is that there is no hidden objective waiting to be found.
What the game does give you is a measurable, self-set one. Pick the tree, and finishing it is the demo's completion.
The one measurable target in the demo
The upgrade tree is the only thing in the demo with a finish line. One playthrough maxed out all the available upgrades, and it took about four and a half hours. Every node in it is listed in the upgrade tree guide.
Beyond that, the demo's other systems are open-ended by design: food keeps coming, the underground keeps generating, and the colony keeps expanding for as long as you want to keep it going.
What the full release adds
The developer has said the full game is a much larger build than the demo. The full release is scheduled for 3 November 2026 and adds:
- 10+ mushrooms, both to produce and to protect.
- More animals, on the ground and underground — not just the hedgehog.
- Different levels of soil, so the underground stops being one brown layer with a dark band under the grass.
- Some of what players asked about in the demo, already in the full version.
What those new mushrooms do is in the mushroom mutation list, and what the deeper soil changes about getting through the ground is in soil types.
Until then, the demo is where the colony keeps growing, and the tree is the only thing worth pointing a session at.