Hi, the demo update just landed and it introduces Artifacts feature!
When mining you can now find artifacts which are buried under tiles - you need to uncover entire artifact to collect it.
You can find collected Artifacts in the "Artifacts" tab - here you can check what they do and upgrade them with Scrolls - a new resource that spawns once you find your first Artifact. You can also upgrade Artifacts by collecting duplicates.
You will find your first Artifact in the second layer/biome.
On top of that I made few fixes/adjustments here and there.
Cheers!