Android game data and cache size increasing

Hi, I’ve noticed when I built my game is that every time I open the app and play it, the data and cache size increases. My game is just a simple shooter with no textures, and just additional music audio to it. What could be possible causes and factors for its increase? Thank you!
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Note:

I’ve also integrated admob and it has a currently working ad system. My file saving is with the use of binaryformatter which i mostly followed from brackey’s tutorial.

Apps that depend on a stable internet connection usually download data to work properly. The data may include pictures, videos, audio files, fonts, documents, scripts and other data that makes the app work. This data is saved as cache so it could be reused when you access that app again.