Don't expect it to go on sale for more than 33% off.

Anyway, it's well worth the full price. The platforming is strong in this one. Indeed it is so strong I bought it for PC (Humble Store) and 3DS a few days ago. :)

My bad. I checked the price history on Isthereanydeal.com and it showed it increased slightly in price some time after release (and there once more soon after). I assumed there was starting sale and haven't checked. Now I see the change in price was only for euro price and the dollar one stayed the same. So it was only GOG pricing thing, no sale.
Sorry for causing confusion.