My game is too big

Hello every one iam making 3d sidescroller android game,i just made two levels and now my game is 90 mb i want to make 100 levels and then my game will be 1gb or more any suggestions how to make my game smaller so every one will playit

Here are few suggestions -

  1. Unity Manual: Reducing the File Size of the Build

  2. Unity Answers: File size is far too big!!

  3. Texture optimisation and size tips in Unity 3D

  4. Finally, if you are making 100s of levels. Best way is to serializing the scenes and just instantiating prefabs at level load. That is load your textures at runtime. Here is a tutorial.