We tried giving some kind of message at the end like that dude always wanna go forward without looking back but in the end you'll just get stuck if you don't take the time to look back a bit, but yeah the problem is then it confuses some players. The final game will have a proper end though!
Yeah, in general trying to philosophise about something you're actively encouraging players to do as a part of the challenge and fun of the game, and in general *punishing* players for engaging with your produce, never works out. Unless of course, you make it quite tongue in cheek - like
~It's a shame the hero could never look back~
~~Now he's trapped forevermore~~
~~~(psst that's the end guys! thanks for playing)~~~
Which makes it clear.