Compression and file size

For the project, the game has to be under 500mb, i was having an issue with compressing the files and the game ended up being 1.1gb in size. I ended up going into photoshop and changing the individual images into gif's rather than png's to reduce the file size but that was doing nothing for the overall size of the file.

Instead i opted for changing the maximum size inside of unity for each image to 1024 instead of 2048, this reduced the file size dramatically and pushed it under 500 immediately.