The 1.2 version on Humble doesn't have any major differences between the 1.1.1 on GoG, other than some internal code with achievements being changed. It's all code based, and nothing anyone'd ever notice in game play.
We're working on a full v2.0, but as we've said - our time is limited these days. We only have part-time to work on our games, and we've been concentrating on finishing up Roehm to Ruin. v2.0 comes after that and Fortress of Fire after that.
Being able to buy the great sword is a glitch that comes from stat grinding on day one, a feature we've removed in v2.0. If you don't have your old sword, you're basically SOL because the game is coded to use the sword you're supposed to have, the basic sword.
Bt