That is an impressive work! I haven't played the original demo (but I'll download it to give it a shot), but this plays very well and has a nice feeling to it.
I'd say the save rooms are too far away apart xD And I feel the infinite jump is quite hard to pull off.
That being said, I think you have quite a neat game engine there. Congrats!
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Don't worry, I kinda get used to it playing itch.io games ^^ "XCVBN" are the same keys whether you are on a QWERTY or an AZERTY keyboard, I usually try to bind my games to those letters to make sure it is good for everybody. It does seem only French and Belgian people uses AZERTY keyboard, interesting.
Thanks for the tip for the infinite jump!