We’ve updated our most recent post with new mac and windows builds that fix a major bug that cropped up. If you started playing on challenging, the bug would end up changing the difficulty back down to casual, when you died and respawned. Since having another difficulty level is a cornerstone of this release, if you’d already downloaded the previous one and feel like challenging doesn’t change anything, you probably want to download again.
This is especially embarrassing to us since we’ve put so much time and effort into having another difficulty level. It seems that the reason we never found it is that almost every time we tested the higher difficulty, we used a special commandline option to jump-start the game on a level later into the game, with higher difficulty (allowing us to test the game in segments). Because this option internally works in slightly different way than our difficulty-selector screen, it prevented the “revert to casual” bug from happening to us. There are several lessons to be learned about software QA here.
Thanks for sticking with us, sorry if that bug means you needed to download again.