Major Feature: Upgradable Cards

This update finally brings in a card upgrade system to the game which will add an extra layer of progression to the game as well as increasing build variety. You can now find anvils at Rest stages which will allow you to upgrade any non-upgraded card in your deck.

Cards can have multiple upgrade paths and by default you will be able upgrade 1 card at each anvil. However, in the future there may ways to increase the number of upgrades you have available.

At the moment most cards only have a single upgrade path and are typically simple stat upgrades, however I have plans to eventually replace most of the current upgrades with more interesting ones. There will also eventually be new icons and visual effects for different upgrades depending on the nature of the upgrade.