Basically the checkpoint saves some files on ur PC and thats why u cant restart even if u reinstall, but u can just delete those files and play a "new game", I thought adding it as an option but I decided that no one will want to replay the game from the start, https://virtual-reality-piano.medium.com/solved-where-is-unitys-playerprefs-stor... , this is how u do it and u have to replace company name with ViksyProductions and SkinnedAlive for the game name, u will see it