Fix issue where killing an enemy resulted in orb being rendered with rat sprite on top

src/core/config/GameConfig.ts

@@ -26,17 +26,30 @@ export const GAME_CONFIG = {
     roomMaxHeight: 10
   },
   
-  enemy: {
+  enemies: {
+    rat: {
       baseHp: 8,
       baseAttack: 3,
+      baseDefense: 0,
       minSpeed: 80,
-    maxSpeed: 130,
+      maxSpeed: 110,
-    baseHpPerFloor: 5,
+      expValue: 5
-    attackPerTwoFloors: 1,
+    },
+    bat: {
+      baseHp: 6,
+      baseAttack: 4,
+      baseDefense: 0,
+      minSpeed: 110,
+      maxSpeed: 140,
+      expValue: 8
+    }
+  },
+
+  enemyScaling: {
     baseCount: 3,
     baseCountPerFloor: 3,
-    ratExp: 5,
+    hpPerFloor: 5,
-    batExp: 8
+    attackPerTwoFloors: 1,
   },
   
   leveling: {

src/engine/simulation/simulation.ts

@@ -128,7 +128,8 @@ function handleAttack(w: World, actor: Actor, action: { targetId: EntityId }): S
       w.actors.delete(target.id);
 
       // Spawn EXP Orb
-      const expAmount = target.type === "rat" ? GAME_CONFIG.enemy.ratExp : GAME_CONFIG.enemy.batExp;
+      const enemyDef = (GAME_CONFIG.enemies as any)[target.type || ""];
+      const expAmount = enemyDef?.expValue || 0;
       const orbId = Math.max(0, ...w.actors.keys(), target.id) + 1;
       w.actors.set(orbId, {
 

src/engine/world/generator.ts

@@ -210,7 +210,9 @@ function generatePatch(width: number, height: number, fillChance: number, iterat
 
 function placeEnemies(floor: number, rooms: Room[], actors: Map<EntityId, Actor>, random: () => number): void {
   let enemyId = 2;
-  const numEnemies = GAME_CONFIG.enemy.baseCount + floor * GAME_CONFIG.enemy.baseCountPerFloor; // Simplified for now
+  const numEnemies = GAME_CONFIG.enemyScaling.baseCount + floor * GAME_CONFIG.enemyScaling.baseCountPerFloor; 
+  
+  const enemyTypes = Object.keys(GAME_CONFIG.enemies);
 
   for (let i = 0; i < numEnemies && i < rooms.length - 1; i++) {
     const roomIdx = 1 + Math.floor(random() * (rooms.length - 1));
@@ -219,21 +221,24 @@ function placeEnemies(floor: number, rooms: Room[], actors: Map<EntityId, Actor>
     const enemyX = room.x + 1 + Math.floor(random() * (room.width - 2));
     const enemyY = room.y + 1 + Math.floor(random() * (room.height - 2));
     
-    const baseHp = GAME_CONFIG.enemy.baseHp + floor * GAME_CONFIG.enemy.baseHpPerFloor;
+    const type = enemyTypes[Math.floor(random() * enemyTypes.length)] as keyof typeof GAME_CONFIG.enemies;
-    const baseAttack = GAME_CONFIG.enemy.baseAttack + Math.floor(floor / 2) * GAME_CONFIG.enemy.attackPerTwoFloors;
+    const enemyDef = GAME_CONFIG.enemies[type];
+
+    const scaledHp = enemyDef.baseHp + floor * GAME_CONFIG.enemyScaling.hpPerFloor;
+    const scaledAttack = enemyDef.baseAttack + Math.floor(floor / 2) * GAME_CONFIG.enemyScaling.attackPerTwoFloors;
     
     actors.set(enemyId, {
       id: enemyId,
       isPlayer: false,
-      type: random() < 0.5 ? "rat" : "bat",
+      type,
       pos: { x: enemyX, y: enemyY },
-      speed: GAME_CONFIG.enemy.minSpeed + Math.floor(random() * (GAME_CONFIG.enemy.maxSpeed - GAME_CONFIG.enemy.minSpeed)),
+      speed: enemyDef.minSpeed + Math.floor(random() * (enemyDef.maxSpeed - enemyDef.minSpeed)),
       energy: 0,
       stats: {
-        maxHp: baseHp + Math.floor(random() * 4),
+        maxHp: scaledHp + Math.floor(random() * 4),
-        hp: baseHp + Math.floor(random() * 4),
+        hp: scaledHp + Math.floor(random() * 4),
-        attack: baseAttack + Math.floor(random() * 2),
+        attack: scaledAttack + Math.floor(random() * 2),
-        defense: 0,
+        defense: enemyDef.baseDefense,
         level: 0,
         exp: 0,
         expToNextLevel: 0

src/rendering/__tests__/DungeonRenderer.test.ts

@@ -69,6 +69,8 @@ describe('DungeonRenderer', () => {
           setDepth: vi.fn().mockReturnThis(),
           setScale: vi.fn().mockReturnThis(),
           play: vi.fn().mockReturnThis(),
+          setPosition: vi.fn().mockReturnThis(),
+          setVisible: vi.fn().mockReturnThis(),
           destroy: vi.fn(),
         })),
         container: vi.fn().mockReturnValue({
@@ -140,4 +142,67 @@ describe('DungeonRenderer', () => {
     expect(corpse1.destroy).toHaveBeenCalledTimes(1);
     expect(corpse2.destroy).toHaveBeenCalledTimes(1);
   });
+
+  it('should render exp_orb as a circle and not as an enemy sprite', () => {
+    renderer.initializeFloor(mockWorld);
+    
+    // Add an exp_orb to the world
+    mockWorld.actors.set(99, {
+      id: 99,
+      isPlayer: false,
+      type: 'exp_orb',
+      pos: { x: 5, y: 5 },
+      speed: 0,
+      energy: 0
+    });
+
+    // Make the tile visible for it to render
+    (renderer as any).visible[5 * mockWorld.width + 5] = 1;
+
+    // Reset mocks
+    mockScene.add.sprite.mockClear();
+
+    // Mock scene.add.circle
+    mockScene.add.circle = vi.fn().mockReturnValue({
+      setStrokeStyle: vi.fn().mockReturnThis(),
+      setDepth: vi.fn().mockReturnThis(),
+      setPosition: vi.fn().mockReturnThis(),
+      setVisible: vi.fn().mockReturnThis(),
+    });
+
+    renderer.render([]);
+
+    // Should NOT have added an enemy sprite for the orb
+    const spriteCalls = mockScene.add.sprite.mock.calls;
+    // Any sprite added that isn't the player (which isn't in mockWorld.actors here except if we added it)
+    // The current loop skips a.isPlayer and then checks if type is in GAME_CONFIG.enemies
+    expect(spriteCalls.length).toBe(0);
+
+    // Should HAVE added a circle for the orb
+    expect(mockScene.add.circle).toHaveBeenCalled();
+  });
+
+  it('should render any enemy type defined in config as a sprite', () => {
+    renderer.initializeFloor(mockWorld);
+    
+    // Add a rat (defined in config)
+    mockWorld.actors.set(100, {
+      id: 100,
+      isPlayer: false,
+      type: 'rat',
+      pos: { x: 2, y: 2 },
+      speed: 100,
+      energy: 0,
+      stats: { hp: 10, maxHp: 10, attack: 2, defense: 0, level: 1, exp: 0, expToNextLevel: 0 }
+    });
+
+    (renderer as any).visible[2 * mockWorld.width + 2] = 1;
+    mockScene.add.sprite.mockClear();
+
+    renderer.render([]);
+
+    // Should have added a sprite for the rat
+    const ratSpriteCall = mockScene.add.sprite.mock.calls.find((call: any) => call[2] === 'rat');
+    expect(ratSpriteCall).toBeDefined();
+  });
 });