I just realized why its so hard to jump over the first water area. You say in your controls that you can use Q,D or A,D to go left or right, depending of you have qwerty or azerty. But you never mention the up button.
I'm on a qwerty myself and I can't use "W" to do a diagonal jump. I can only use "Z" + "D" and that does work.
I think QWERTY keyboard users will be stuck in the first area of the game
Bit of a shame because I discovered there's actually a lot of cool content behind this first area!