I recently downloaded the nightly build v0.6.0-889-g21a115be4-win64.
I played both worlds of the story mode.
The ghost forests level had been added.
Still quite laggy, but beder than it had been for the stable version of 0.6.0.
There was a rendering problem when vsync was set to adaptive.
I would have liked a few more ghost forest levels.
The level The Forest Is Rotting had couple of cheep crush deaths.
Nolok's Tower of Power should have more power-ups.
The ghost tree should be learned about sooner, and have a true fight with it.
Other than these minor problems the ghost forest was very good.
I liked the ghostified throwback to an older forest level.