2D shooter 2.0

This my 2D Shooter project. I made the following significant modifications: 1. Modify the in-game GUI in some significant way. 2. Add custom music to  game. 3. Replace sound effects in the game to update the sound design of the game.  4. Create a complete interesting, comprehensive, and coherent level. Credit:  D.F.Y. STUDIO Created by Ziheng Lyu