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Why the file size is so big?

Hi, I recently made a demo game project. the game is like 2D casino game. For this demo, I didn't used a single image not a single sound file. All I used widget blueprints and lines of blueprint codes. After I finished the game the file was about 12 MB in size but when I made an Android APK the apk size was 169 MB!!!How? I don't know why the file size is so big. I followed some instruction about shrinking file size in my other projects but it just reduce 1/2 MB of total size. I really need help for this, if anyone have any Idea how can i reduce the file size please help me.

Product Version: UE 4.20
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asked Oct 06 '18 at 01:23 PM in Packaging & Deployment

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