If you look at the update logs, I've split them into two parts. The top part is for brand new features, and the bottom part is for features previously seen in order games or the original TA4. Yes, the rain and thunder sounds are from Minecraft. The music is by tomcat on OpenGameArt.
Added rain and lightning that interact with the environment Added recoil and small, random bullet drop Enemies now respawn Added invisible borders which players cannot walk through and enemies switch direction on Added music and sound effects Added WASD and click to shoot Edited the sky Allowed enemies to jump multiple times in order to climb walls Bullets now adjust on Y axis