WebKit

Here some thing thats helps u
Tap at player cube, and add rule

WHEN [this is not in camera viewpoint]
|DO [Destroy this actor]
|[Create a text block with message.                 |(defeat){When tapped=Do nothing}
|[Create a text block with message (restart)
||{When tapped=do a response}
||[Restart this card]

This will kill player if he fly away from card borders, u can add something other, but this is a classic.

Tbh better than the one you see everywhere 

card-ldlz

Main Menu

Daily Mahjong!

card-xM76

Daily Tower Defence

Dice Mania

Title screen

Winter Kayak 3000

Pool

DAILY POOL

ColorMaze

card-oRV2

StickStack

card-7Dyu

Daily Maze

A random test - by @aolesgd on Castle