Update 1 Changelog:
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Easy mode added:
• 6 lives instead of 3
• Boss health reduced
• All small medi packs switched for medium medi packs
• Reviver zombie removed and replaced with ranged enemy
-- Keyboard prompts now appear when playing with keyboard
-- Hit range increased in Z depth
-- Reviver Zombie now has a tip of how to kill it – explosive Kill Required appear above his head