Simplify death screen restart and add biome parallax visuals

index.php

@@ -52,11 +52,7 @@
         <input id="playerName" maxlength="20" required />
         <button type="submit">Save Score</button>
       </form>
-      <div class="play-again-row">
-        <button id="restartBtn">Play Again</button>
-        <button id="restartVipBtn" type="button">Play Again (VIP)</button>
-        <button id="restartVipPlusBtn" type="button">Play Again (VIP+)</button>
-      </div>
+      <button id="restartBtn">Restart</button>
     </div>
   </div>