fix game loop timer

src/game.js

@@ -8,12 +8,14 @@ export default class Game {
   currentTick = 0
   width = 2000
   height = 2000
+  running = false
+  nextTick = 0
 
   #entities = []
   #eventEmitter = new EventEmitter()
   #projectiles = []
   #terrains = []
-  #tickBudget = Math.floor(1000 / this.tickRate)
+  #tickBudget = 1000 / this.tickRate
 
   get entities() { return this.#entities }
   get eventEmitter() { return this.#eventEmitter }
@@ -80,10 +82,23 @@ export default class Game {
     }
   }
 
+  gameLoop() {
+    const tickBudget = this.#tickBudget
+
+    if (this.nextTick != null) {
+      const nextTick = this.nextTick
+      this.nextTick = null
+
+      let start = performance.now()
+      while (start < nextTick) { start = performance.now() }
+
+      this.update()
+      this.nextTick = start + tickBudget
+    }
+  }
+
   start() {
-    const start = performance.now()
-    this.update()
-    setTimeout(() => this.start(), Math.max(0, this.#tickBudget - (performance.now() - start)))
+    setInterval(() => this.gameLoop(), 1)
   }
 
   update() {