[b]Demo Version: 0.3.1[/b] Added a new angelic unit. Now you can retract the last used building-type card. Cards reaching the maximum limit no longer enter the refresh pool. Added upgrades to increase the maximum capacity of the treasure backpack. Adjusted the difficulty of all casual modes. Artifact upgrade coefficient adjusted to 2. The combat button shortcut key is set to the spacebar. Skill shortcut keys are set to Q, W, E, R, and T. Increased damage of the Hunter's Hut by 1. Increased the number of fireballs in the Rain of Fire skill from 10 to 12. Increased the effect of diplomatic cards from 1 to 2. Some adjustments to details. Fixed the issue with the Charm Ring being ineffective.