diff --git a/Main/src/META-INF/MANIFEST.MF b/Main/src/META-INF/MANIFEST.MF
new file mode 100644
index 0000000..37197ef
--- /dev/null
+++ b/Main/src/META-INF/MANIFEST.MF
@@ -0,0 +1,3 @@
+Manifest-Version: 1.0
+Main-Class: Main
+
diff --git a/Main/src/core/board/Board.java b/Main/src/core/board/Board.java
index 7f28c91..5ad5929 100644
--- a/Main/src/core/board/Board.java
+++ b/Main/src/core/board/Board.java
@@ -39,7 +39,7 @@ public Board() {
         // (some calculations to generate the game content)
         final int SIZE = 2;
         int size = (SIZE * 2) + 3;
-        int countEnemies = 1;
+        int countEnemies = 2;
         int countBlocks = (SIZE * (SIZE + 1)) + ((SIZE + 1) * (((SIZE * 2) + 3) - 2));
         int countWalls = ((countBlocks - 9) > 0) ? (countBlocks - countEnemies - 9)/2 : 0;
 
diff --git a/Main/src/core/board/block/blocks/moving/Enemy.java b/Main/src/core/board/block/blocks/moving/Enemy.java
index bfb8a7f..5dca8e5 100644
--- a/Main/src/core/board/block/blocks/moving/Enemy.java
+++ b/Main/src/core/board/block/blocks/moving/Enemy.java
@@ -57,7 +57,7 @@ public void live() {
         // repeat if is not game over
         if (!Board.isGameOver()) {
             try {
-                Thread.sleep(1000);
+                Thread.sleep(500);
                 this.live();
             } catch (Exception e) {
                 System.out.println(e.getMessage());
diff --git a/demo/Main.jar b/demo/Main.jar
new file mode 100755
index 0000000..87a8af9
Binary files /dev/null and b/demo/Main.jar differ