iOS app package size is so big

cocos2d-x JavaScript
2

See ccConfig.h

You can disable various engine features and avoid linking libraries you don’t need.

#define CC_USE_TIFF  0
#define CC_USE_3D_PHYSICS 0
#define CC_USE_PHYSICS 0
#define CC_ENABLE_SCRIPT_BINDING 0

No idea how much this will shave off though. It’s worth looking inside the archive you create to see the ratio between assets and binary too.