How to reduce packaging size? (Android)

Development Platform & Builds Mobile
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  1. I created a 2D platformer project with Mobile/Tablet, scalable 2d/3d with starter content.
  2. I deleted all the content, added my own sprites (7~ of them). Placed down the background and a camera, so that i can see if the game is on or not.
    Here is the issue. When i package the game (Development) it always comes out as 50+ mb game. How is it possible to go under that limit?

Also my Galaxy S3 crashes each time i launch it.

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Have you tried this yet: Why are android file sizes so big?