Thank you for your comment, it's very nice !
About the variation of obstacles, the purpose of the game was to see the evolution of the character into someone's mind, so I thought that if the levels were the same, this purpose would be more explicit. And about the jump, if you haven't noticed, in every level, the character is harder to move, so the unresponsive jump was made on purpose, to make the player feel like he's deconnecting from reality. But thank you for your advices !