fix some bugs

additions:

added some sfx to tiger enemy

bug fixes:

fixed a bug where holding shift while grabbed would allow the player to clip out of bounds

fixed a bug where killing a slime would cause a crash.

current bugs

found a problem where the 'tabtogiveup' prompt is not visible due to a webgl error preventing the image from loading.

potential game crash on start up. only effects some users. need more info