How do I reduce game.zip size?

It's a small game but is 28 megabytes. I need it to be only 10 megabytes to upload to arcade. HOW? lol I went into zip file, deleted all my unused sprites or ones i accidentally hid somewhere, but its still 28 megabytes.

How many sound files you have?

There something wrong with your files.

none.... I didnt add any music or sound effects. Theres only pic files, not too big either. all in the smaller kb range

What about sprites image frames?

Have you used the crop tool in the image editor?

yeah but i got to share it thru a google drive link to people. I used the "get rid of empty space tool" on some things. Bakcgrounds are actual sky images, high res. around 1,000 kb for both backgrounds i used. Sprites were drawings with empty space cropped out.

If you exported in node-kit, the file includes the chrominum files to run the application. That would explain it maybe.

i just used construct itself and the "export for scirra arcade" option. Automatically zipped it into game.zip

Try to export to Html5 and see how bit is the file