Cards + Passives Update

This week's update adds a bunch of new cards, a new 'rare' card type, and passives: permanent upgrades that fundamentally change gameplay.

• New passive upgrades
• New cards
• New "rare" card type for especially strong cards: they show up occasionally on their own, but can also be obtained with the new lock card
• New "love" bullet effect, which causes enemies struck to fight for you
• New special card: the lock, which transforms into a random rare card after three turns
• Enemies speed up slightly as you level up to make the game more challenging at higher levels
• QWER hotkeys to play cards quickly (press to aim, release to shoot)