Version 1.0 is a full rewrite of the app, from scratch. It contains a brand new UI, a number of new actions and gates, and implementation of the Android 12 'Columbus' gesture code and models, including a new Low Power Mode for Pixels.
You can read more here: https://medium.com/@KieronQuinn/tap-tap-v1-0-restarting-from-scratch-2b87c241d176
If you are updating from an older version, it's recommended you backup your settings first. The update will automatically migrate your settings, but in the event it fails a backup will prevent you losing your configuration.