my game size is 87 mb how can i reduce it
Remove unused files from your project folder. Compress sound/music files, compress high resolution images.
For video files, you can use Handbrake.
For sounds, you can convert to mp3 or ogg, minimum 128kbps, recommended 256kbps, optimal 320 kbps. For images, I use FastStone photo resizer, not sure if it’s really suited for games, but it’s very efficient.
Events themselves don’t take much space.
Also keep in mind that no matter what platform you export to (excluding just web/html5), Electron is going to add ~200 mb. I wouldn’t worry about 87 mb.
And mobile, cordova is used there (and cordova adds very little overhead).