I like the character art and the zombie art the most - I think they look really good, so good job with creating those. I had an issue with the camera when moving the character. He should stay more or less in the center of the camera view but he persistently is stuck to the left edge which means you cant see any of the zombies you dodged and then they snack you easily to end the game. I'm actually in the process of building a similair game to this myself, so I appreciate the gun rotation and the bullet instantiation and it worked really well as your core mechanic. Nice work. I want to encourage you to keep building on this game if you want because there is a lot of scope for you to work with here.