Not every mouse has a scroll wheel, best to have an alternative if it's a required action to make it through the tutorial. If I select a character in a fence and click to move outside the closed gate it crashes:
The error was: uncaught exception: abort(142) at jsStackTrace (Tiny Planet.asm.framework.unityweb:2:27465) stackTrace (Tiny Planet.asm.framework.unityweb:2:27636) abort (Tiny Planet.asm.framework.unityweb:4:31788) ...
Also, one of the characters got stuck just outside the gate, but the other was sucked up by the rocket, so I had no recourse but to restart the whole game..