Thanks for pointing this out, looked like a solid game so I picked up a copy from ShopTo.
A few days ago Oldmario told me that there was a good price on PQube's Day One Edition for WORLDEND SYNDROME available and since it had low stock availability status I ordered it. I randomly asked my receptionist if I had any packages today (just in case it arrived) and it did. I was nervous for a moment that I had ended up with just a standard copy but thankfully it's the Day One Edition. For under £15 it's a solid deal.