It seemed confusing and inconsistent to me.
Like, if I go to the right from the start, and go off the cliff instead of going up the ladder, I just die immediately, so my first thought is that maybe since you're going backwards, you're going back in time and therefore you can't fall down somewhere unless you could have made the jump up going forwards in time (which I think could potentially be an interesting idea for a game). But other parts of the game don't seem to follow that rule, and also it isn't obvious that the jump is too high to make (unless he can't go that way because that's not where he came from?).
And then I come to some platforms over a pit. After dying randomly a few times, I figure out that there are invisible platforms in places where there are holes, so what's safe and what's not safe is reversed. But that also doesn't seem consistent; there's plenty of regular ground that both seems safe and is safe.
(And I still don't know why I can't go left after going up the ladder.)
Maybe there's something I'm not understanding, or something's not working right on my computer? Or maybe it's just supposed to be a series of separate puzzles that don't all follow the same rules and I'm just reading too much into it? Reverse of making sense is not making sense, reverse of being consistent is being inconsistent.
Anyways, the game is cute, and I did notice that "yxof" was "foxy" backwards before seeing the comment below.