Make an object hug a wall?

I've been having some trouble making an object hug the inside of the wall flawlessly.

At the minute I have it moving whilst overlapping the side/floor, then changing direction when it collides with a wall, or when it's not overlapping.

It works fairly well, but every so often it gets stuck, was wondering whether anybody knew of a better way of doing it?

Here's the html

Here's the CAPX

Thanks in advance =)

Anybody? Really struggling with this =/

wallHugMovement.capx

Thank you so much, this will be very useful. I'll give you thanks in the credits of the game I'm making =)