I think these are all the sound effects?

Sound Effects

General effects:
- jump
- fall off screen
- get key and move to next level
- overlay world (maybe different for each world type?)

Zombie world:
- zombie growl
- player killed by barbed wire
- player killed by zombie
- zombie dies

Ice world:
- slide on ice
- shatter ice
- polar bear comes out
- eaten by polar bear

Nature world:
- bounce on tree branch
- bees buzzing (louder as they get more agitated?)
- player eaten by bees
- butterfly opens/closes wings
- butterfly carries player upward
- wind (background noise)

Space world:
- spaceship shoots laser
- player hit by laser
- spaceship destroyed
- asteroid slowly flies downward due to gravity