Beta 29 - another bugfix release

Beta version 29 released

• Sometimes the game crashed at the turn of the year.
• 3D view with full optimization became incredibly laggy when a cabin was visible.
• Diving for limonite didn't yield anything. The underlying cause was a bug in handling task outcome, which affected various other tasks like digging for clay etc.

Oh, and we have a new trailer video with the upgraded graphics!