Version 8.0 has been posted. It includes lots of small changes. The most notable ones are:
The main menu has changed. It should now be a lot easier to use.
Adventure mode has been expanded.
Close to 20 medals were added. Earning certain combinations of medals unlocks new avatars!
You can use X to swing your pick ax as a weapon.
A tutorial mode was added.
I'm aware that the game likely has performance issues. I typically don't notice any problems on my computer, but after expanding the adventure mode map (the size of the map more than doubled) I noticed some performance issues.
You can direct bug reports to the comments on this page or this thread on my forum.