v3.1
Improved the appearance of the boulder (roughened), the diamond (transparency and random sparkles), and the butterfly.
The Start screen now allows the cave and level to be set by pressing the appropriate letter key (for the cave) or number key (for the level).
Bonus caves now become selectable on the Start screen once the preceding cave has been completed at all difficulty levels. For example, bonus cave Q appears after D–1 through D–5 have been completed.
Improved support for BDCFF level packs.
[Windows] Fixed a problem where full–screen mode wasn’t always restored when the app was restarted.
Lots of small improvements and fixes.
