Split out start/stop timer for worm

src/core/states/game.lua

@@ -111,6 +111,10 @@ function Game:enter()
         Siren.new(self),
         Worm.new(self)
     }
+
+    for _, enemy in ipairs(self.enemies) do
+        enemy:enter()
+    end
 end
 
 function Game:update(dt)
@@ -175,6 +179,12 @@ function Game:draw()
     end)
 end
 
+function Game:exit()
+    for _, enemy in ipairs(self.enemies) do
+        enemy:enter()
+    end
+end
+
 function Game:resize(w, h)
     self.effect:resize(w, h)
 end

src/entities/enemies/worm.lua

@@ -37,11 +37,15 @@ function Worm.new(game)
     end
 
     self.timer = Timer.new()
-    self.timer:every(self.stats.moveDelay, function() self:_move() end)
+    self.timerHandles = {}
 
     return self
 end
 
+function Worm:enter() self:_startMoving() end
+
+function Worm:exit() self:_stopMoving() end
+
 function Worm:update(dt)
     self.timer:update(dt)
 end
@@ -85,6 +89,14 @@ end
 
 function Worm:getSize() return self.size.w, self.size.h end
 
+function Worm:_startMoving()
+    self.timerHandles.move = self.timer:every(self.stats.moveDelay, function() self:_move() end)
+end
+
+function Worm:_stopMoving()
+    self.timer:cancel(self.timerHandles.move)
+end
+
 function Worm:_findSpawnPoint()
     local pos = random.chooseUntil(self.game.env.nodes, function(element)
         local distanceToPlayer = vector.dist(element.x, element.y, self.game.player:getPos())