Hi !
Thanks for playing :)
Oh so it was beatable, I didn't have the courage to play very carefully, so I put an end message in case someone could win
I don't think it's a bug neither, you were just smarter and very patient I think (I tried few times, but always finished doing a mistake..)
If you want to see the normal ending, I did a full gameplay video so you can see the ending cinematic (from 5:50)