add dead state

src/game.js

@@ -8,8 +8,7 @@ export default class Game {
   currentTick = 0
   width = 2000
   height = 2000
-  running = false
-  nextTick = 0
+  nextTickAt = 0
 
   #logic = null
   #entities = []
@@ -88,15 +87,15 @@ export default class Game {
   gameLoop() {
     const tickBudget = this.#tickBudget
 
-    if (this.nextTick != null) {
-      const nextTick = this.nextTick
-      this.nextTick = null
+    if (this.nextTickAt != null) {
+      const nextTickAt = this.nextTickAt
+      this.nextTickAt = null
 
       let start = performance.now()
-      while (start < nextTick) { start = performance.now() }
+      while (start < nextTickAt) { start = performance.now() }
 
       this.update()
-      this.nextTick = start + tickBudget
+      this.nextTickAt = start + tickBudget
     }
   }