v0.1.7 - Tower Power!

Updates today:

• Added new upgrade cards that give elemental attacks to Guardians. They start with 1 standard arrow and an upgrade will add a special arrow to their quiver, so one upgrade will be every other attack, a second will be an effect on 2/3, and so on. Only one per element is available, but their effects are affected by the normal Boost upgrades that the player can purchase.
• Added a health bar to the player
• Ice and acid duration reduced
• Performance improvements