I hadn't played that before, but it's great! The walljump is the only glitch I really figured out how to do consistently back when I was messing around with klik regularly... actually the biggest inspiration for this was probably Adventures of the Retarded Goat from way back in the day (I love that Winsky even went so far as to code the glitch into a 3D engine for one of the remakes).

Don't see why you wouldn't be able to get back into play. With the way Klik & Play handles screen edge collisions, hitting the sides should place you back inside the playfield no matter how far off the screen you've fallen.