Yes, there's an ending and it's necessary to reach it in order to progress in the game
I honestly can't say if it was in this game.
But I remember some little saw parcour (where you have to climb up right down and there are saw paths there, so you have to jump from safe corner to safe corner when the saw isnt in front of you.
further right, tthere were 3 or 4 vertical saws quickly going up and down and you have to time it gto get through.
an dhtne there was some gray or such door to the right, with a pitch black room behind.so you couldnt see whats in there.
and even the character when interacting with the door, says something like "the door is closed. there must be a way to open it. i wonder what is behind"
at the time I thought theflare gun would be behind it but didnt know how to open it so i went away. and later elsewhere i got all the items and finished the game. totally having forgotten about it. until now.
so what was up with that room, was there a way to openit?
or just a troll kind of thing? :-)