Thanks for reporting all the issues related to the new update. Here is a patch fixing most of the reported issues. We're still working on the performance issues!
Improved how the chitin bar evolves visually.
Fixed an issue where leveling up the main clan would also level up the second clan to the same level.
Fixed a bunch of localization issues and grammar errors.
Items generated by the "Forge" keyword are now randomized during each run. They used to always be the same.
The achievement requiring players to inflict damage with spikes no longer triggers from enemy spikes.
The achievement requiring players to inflict poison damage now only triggers from poison inflicted on enemies.
Fixed a level where you could place your units right next to an enemy.
Midas no longer shows the Overkill tooltip.
Survivor now only triggers when a battle is won.
Improved the UI of the Blight Purge challenge selection.
Changed some achievement visuals to be more consistent with the rest of the game.