You need to build training camps and assign Ratizens to them. After some training, those Ratizens will help fight off enemies. Keep in mind that being a soldier is a job, so you cannot have loads of soldiers early on or you won't have enough for other jobs. However, I've found 1 or 2 soldiers sufficient for the demo. Hope this helps!
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A pair of tilesets for sidescroller games, particularly platformers
Neon health bar for a sci-fi/cyberpunk game
16x16 pixel art signs for games
Animated 16x16 icons to display status effects on the UI of a game