Somewhat Mediocre
At first glance its rather confusing that you wouldn't be able to move but then again that explains the scope that you gotta aim at them. Its quite challenging yes but I say also probably short term game since for me it is kinda laggy and the health bar seems to go down too quickly. Second game you made and from graphics it looks like a well basic effort put out for a novice. I would say good start for you but I suggest that you add some benefits to make the player last longer cause well it gets a bit boring. I THOUGHT you could have played as a zombie since there was two play buttons