Web manifest for twine game

manifest.json

{
  "lang": "en",
  "name": "My Game",
  "short_name": "My Game",
  "description": "My super awesome twine game",
  "start_url": "/index.html",
  "background_color": "#000000",
  "theme_color": "#202020",
  "display": "standalone",
  "icons": [{
    "src": "icon-256.png",
    "sizes": "256x256",
    "type": "image/png"
    }, {
	"src": "icon-32.png",
	"sizes": "32x32",
	"type": "image/png"
  	}, {
	"src": "icon-192.png",
	"sizes": "192x192",
	"type": "image/png"
	}, {
	"src": "icon-180.png",
	"sizes": "180x180",
	"type": "image/png"
	}, {
	"src": "icon-270.png",
	"sizes": "270x270",
	"type": "image/png"
  }]
}