And now ;D WebGL build is the next version of the game that means you can play it without any installation .
Where ? How ?
You can play Into The Coffin WebGL version on game page in itch.io site ,Or here ….. yes here. There is a WebGl version at the game page On this site. Just from top menu Go to Games > into the coffin and the end of the page you can see WebGL version 😀