diff --git a/src/Config.ts b/src/Config.ts
index 6f48bab..6a64d0a 100644
--- a/src/Config.ts
+++ b/src/Config.ts
@@ -2,7 +2,9 @@ const STORAGE_KEY = "ants-simulation-config";
 
 const defaults = {
     worldSize: 1024,
-    antsCount: 12,
+    antsStartCount: 4,
+    antBudget: 512,
+    seedWorld: true,
     simulationStepsPerSecond: 60,
     scentThreshold: 0.01,
     scentFadeOutFactor: 0.001,
diff --git a/src/GUI.ts b/src/GUI.ts
index 7ae8f31..e23d068 100644
--- a/src/GUI.ts
+++ b/src/GUI.ts
@@ -26,10 +26,14 @@ class GUIController {
             .step(1)
             .onChange(() => this.saveAndEmit("reset"));
         simFolder
-            .add(Config, "antsCount", 0, 22)
-            .name("Ants count    2^")
+            .add(Config, "antsStartCount", 0, 64)
+            .name("Starting ants")
             .step(1)
             .onChange(() => this.saveAndEmit("reset"));
+        simFolder
+            .add(Config, "seedWorld")
+            .name("Seed home + food")
+            .onChange(() => this.saveAndEmit("reset"));
         simFolder
             .add(Config, "scentFadeOutFactor", 0, 0.01)
             .name("Pheromone evaporation factor")
diff --git a/src/Renderer.ts b/src/Renderer.ts
index d1b0d54..3374d96 100644
--- a/src/Renderer.ts
+++ b/src/Renderer.ts
@@ -72,7 +72,7 @@ export default class Renderer {
     }
 
     private initResources() {
-        const antTextureSize = Math.round(Math.sqrt(2 ** Config.antsCount));
+        const antTextureSize = Math.ceil(Math.sqrt(Config.antBudget));
 
         this.resources = {
             worldRenderTarget: new THREE.WebGLRenderTarget(
@@ -325,7 +325,7 @@ export default class Renderer {
     }
 
     public reset(scenes: SceneCollection) {
-        const antTextureSize = Math.round(Math.sqrt(2 ** Config.antsCount));
+        const antTextureSize = Math.ceil(Math.sqrt(Config.antBudget));
 
         this.resources.worldRenderTarget.setSize(
             Config.worldSize,
diff --git a/src/__tests__/constants.test.ts b/src/__tests__/constants.test.ts
index 57ff24c..dfd0435 100644
--- a/src/__tests__/constants.test.ts
+++ b/src/__tests__/constants.test.ts
@@ -1,4 +1,5 @@
 import { describe, expect, test } from "bun:test";
+import { defaults } from "../Config";
 import {
     MAT_AIR,
     MAT_DIRT,
@@ -31,3 +32,22 @@ describe("material ID constants", () => {
         }
     });
 });
+
+describe("config defaults", () => {
+    test("antsStartCount is a direct count, not an exponent", () => {
+        expect(defaults.antsStartCount).toBe(4);
+        expect(defaults.antsStartCount).toBeLessThanOrEqual(64);
+    });
+
+    test("antBudget determines texture pool size", () => {
+        expect(defaults.antBudget).toBe(512);
+    });
+
+    test("seedWorld defaults to true", () => {
+        expect(defaults.seedWorld).toBe(true);
+    });
+
+    test("old antsCount key does not exist", () => {
+        expect("antsCount" in defaults).toBe(false);
+    });
+});