First and Final Update

This is the first(and probably the only) update to the game. Here is EVERYTHING that I added/changed: Added some particle effects to the enemies(when they die) and the bullets(when they hit something), added new sound effects to the enemies(explosion sound when they die) and to all the buttons in the Menus and Pause Screen, added more info on the Instructions Menu, changed the volume of the background music(it was WAY too loud) and when collecting the healing kits, fixed an issue where the background music would duplicate if you exited a level and chose another one(that's just annoying), and finally I made the Player slow down when it touches mud and changed the layout of the levels a bit. Overall, this isn't much but hopefully it will make the game feel more polished and less "Game Jammy".