If you want to use gestures to snooze your alarm, I have some suggestions for you:
In Settings on your Apple Watch or iPhone, select Accessibility > AssistiveTouch > Gestures.
Turn on gestures and select a gesture, such as pinching twice or making a fist twice.
Select the play action for this gesture and select Play/Pause as the preferred setting. When you receive an alarm reminder, you can pause the alarm by making this gesture.