From now until just under 21 hours time (until 11am PST 17 May 2014) Proteus is available as part of the 24-hour re-issue of Humble Indie Bundle 8. Go here to grab it: https://www.humblebundle.com/
We've also just uploaded patch 1.2.1 which is mostly a stability fix for OSX (but required a deceptively large amount of work, porting to SDL2)
Any problems, let me know at firstname.lastname@example.org
or @edclef on twitter.
(Never tried posting an announcement before - hope it shows up!)