Yet another 2D Shooter

This is a mini project for a gaming course. The following changes were added: 1. A Boss level with a boss health bar. I recycled existing sprites for the bosss appearance and created new pixel art to visualize the health bar. New code was added to program the level behavior and the health bar animation. 2. Players health visualization. I added three hearts to visualize the remaining lives. Includes pixel art and new code snippets. 3. New enemy. I added a skull that spits fire and blocks the way....