Problem description: Even when the game is paused, the Triphid creation and bullet sounds still continue as if Triphids were being created and as if bullets were still being fired at the player.
Steps to reproduce: 1. Play a level. 2. Observe the sounds the Triphids make as they are created and as they fire bullets at you. 3. Pause the game. 4. Observe that the sounds being played while the game is paused are the same as the sounds observed in step 2.
Desired behavior: When the game is paused, no Triphids should be created and no bullets should be fired at the player. As such, no sounds signifying that this is happening should be played either.
