"The big bad boss is defeated, the coins are collected and the princess has been rescued." Well, the only thing left for you is to undo everything that led up to that.
Hopefully Spoiler Alert doesn't end up just being a normal platformer that you play from right to left instead of left to right. We'll give them the benefit of the doubt, because the idea sounds pretty cool!
No release date announced yet, but it's coming to Android, iOS and Steam.