itch.io

 If you already have the game installed, downloading the new version just updates it. You can also delete the old version once you've installed the new one.

If you're on PC, Mac or Linux and you have the Itch app then the game will download and install a patch for you. Once that's done, just play as normal!

If you're on PC, Mac or Linux and you're not using the Itch app, then download the update from one of the files above (as you did when you first downloaded the game), extract it to a fresh folder, delete the old folder and play!

If you're on Android then unfortunately you don't get patches even if you're on the Itch app. Download, extract if necessary (sometimes Itch bundles the APK in a zip) and install the new APK on top of the old one. DO NOT DELETE THE GAME!

In all cases, your saves will automatically be detected by the updated game :)