reduce .unity3d file size

Hello. I made a game and would upload it on kongregate. But there is one problem. My game file size is too big. It has 35mb and kongregate allows only 25mb of file size. What can I do? How can I reduce the size of the .unity3d files without deleting any models in my game? NEED HELP

Reduce the size/quality of textures/sounds/etc.

In the project tab, search for something in your game (like your car). the click on it so it opens in the inspector. Click one of the pictures (default, web, standalone,android etc.) and select “override for “x””. then bring down max size to 32 or 60 or whatever you want.
Hope it helps!!