diff --git a/main.lua b/main.lua
index ca34cee..4ad9074 100644
--- a/main.lua
+++ b/main.lua
@@ -104,9 +104,11 @@ function love.update(dt)
 		for i, shot in pairs(shots) do
 			for j, enemy in pairs(enemies) do
 				if collision.collisionTest(shot.shape, enemy.shape) then
-					sound_enemy_hit:play()
-					table.remove(shots, i)
-					table.remove(enemies, j)
+					if enemy.object_type ~= "invinc" then
+						sound_enemy_hit:play()
+						table.remove(shots, i)
+						table.remove(enemies, j)
+					end
 				end
 			end
 		end
diff --git a/modes.lua b/modes.lua
index ee49d9c..e7ca840 100644
--- a/modes.lua
+++ b/modes.lua
@@ -11,7 +11,7 @@ mode_see = {
 	func_key_released = stop_rotate_on_key,
 	func_update = function(dt) 
 		reset_movements()
-		rotate(player, dt)
+		player:rotate(dt)
 		update(player)
 		update_other_objects(dt)
 	end,
@@ -27,7 +27,7 @@ mode_move = {
 	func_key_released = stop_move_on_key,
 	func_update = function(dt) 
 		reset_rotations()
-		move(player,dt) 
+		move(player, dt)
 		update(player)
 		update_other_objects(dt)
 	end,
@@ -80,8 +80,13 @@ function update_other_objects(dt)
 	if enemies_spawned < math.floor(game_time / enemy_spawn_interval) then
 		-- e.g. game_time = 6.01 => game_time / enemy_interval = 3.005
 		-- so if enemies_spawned == 2 then spawn 
+		sound_enemy_spawn:play()
 		enemies_spawned = enemies_spawned + 1
-		spawn_enemy()
+		if game_time > 60 then
+			enemies[#enemies + 1] = random_of_two(spawn_enemy(), spawn_invinc_enemy())
+		else
+			enemies[#enemies + 1] = spawn_enemy()
+		end
 	end
 	for i, enemy in pairs(enemies) do
 		enemy:move(dt)
diff --git a/objects.lua b/objects.lua
index a937e05..9d30545 100644
--- a/objects.lua
+++ b/objects.lua
@@ -44,7 +44,7 @@ function spawn(object_type, args)
 		enemy.round = 0 
 		enemy.filling = "fill"
 		enemy.shape = c.makeRect(enemy.x, enemy.y, enemy.width, enemy.height)
-		enemy.draw = get_value(args, "draw", draw_rectangle)
+		enemy.draw = get_value(args, "draw", draw_single_rectangle)
 		enemy.move = get_value(args, "move", move)
 		enemy.update = get_value(args, "update", update)
 		return enemy
@@ -127,13 +127,19 @@ function spawn_enemy()
 	args.x_speed = math.random(min_speed, max_speed) -- TODO: Change max/ min when "levelup"
 	args.y_speed = math.random(min_speed, max_speed)
 
-	enemies[#enemies + 1] = spawn("enemy", args)
+	return spawn("enemy", args)
+end
 
-	sound_enemy_spawn:play()
+function spawn_invinc_enemy()
+	local enemy = spawn_enemy()
+	enemy.object_type = "invinc"
+	enemy.filling = "line"
+	enemy.x_speed = enemy.x_speed * 2
+	enemy.y_speed = enemy.y_speed * 2
+	return enemy
 end
 
 -- Draw functions
-
 function draw_rectangle(object)
 	love.graphics.push()
 		love.graphics.translate(object.x, object.y)
@@ -145,6 +151,14 @@ function draw_rectangle(object)
 	love.graphics.pop()
 end
 
+function draw_single_rectangle(object)
+	love.graphics.push()
+		love.graphics.translate(object.x, object.y)
+		love.graphics.rotate(object.rotation)
+		love.graphics.rectangle(object.filling, - (object.width / 2), - (object.height / 2), object.width, object.height)
+	love.graphics.pop()
+end
+
 function draw_ellipse(object)
 	love.graphics.push()
 		love.graphics.translate(object.x, object.y)