Help with mobile controls

I’m uploading one of my games to google play, but I am trying to figure how to make it so when you hold down the button, it keeps turning until you take your finger off. Any ideas? Here is my game: https://flowlab.io/game/play/767506

I don’t know how to make it so you can hold down but I suggest you make your game get harder over time and make the make bigger you know make enemies get faster or spawn faster

I already did. after 30 seconds, they turn white and travel three times as fast

many use a always and a switch with the controls