So I'm currently exporting a project to the NW.js format (as that's the closest to an exe I can get), and it's throwing out sizes of 150 mb for windows, 250 for mac.
Bearing in mind, I have no videos, very few seconds, all images are low quality gifs and Jpegs (most images are under 100 kb). All my images are compressed for export to JPEGS, a good amount are at 1 quality. As a test, I deleted all my sounds, all my textboxes, a load of my JPEGs, exported and it still came out to the same size, minus a mb or two... Not sure if this is a bug or not. The entirety of all the used assets in my windows folder don't even come up to this amount.