App Store size almost 15 times more then iPA

Hello Friends, I am making a iPhone game, I have already created the android build and the apk is 355 MB in size, When i create the iPA file its also about 355 MB , But when i try to install it then itunes it shows the size to be 4.2GB . The game has a lot of 30 fps animations implemented with spites, SO there are a lot of sprites like 2000 to 3000, I am using the Texture as Sprite, pixel per Unit to be 150 and size limit to be 256

I tried and removed most of the Sprites to see if that is the problem, But even after removing almost all the sprites the iPA size was reduced to 138 MB and the itunes app size become 2GB , And so i think there is something wrong, Because even after i remove all the animations its still very Huge,

I am not using Testflight, Can anybody please help me with this, I want to reduce the App store size of the. Thank You Very Much,