Atmosphere is programmed to be plugged in and left to play. Once you select a channel, it is not meant to be controlled by the device buttons, so place the remote somewhere safe (with the charger nearby!) and enjoy everything that is Atmosphere.
Of course, if you ever want to explore different channels (and we hope you do!), you'll need your remote for that.
Also, it's good to know the device will automatically power off when your TV is turned off, so it is not necessary to power the off your device.