I think I can see some Celeste-Influence here ;) I was about to do a "you can only jump once"-game for this jam too, but then I thought: is even this single jump necessary? You create a move set that lets you overcome hurdles without jumping anyway, why then even give a "free" jump... but thats just some thoughts I had in general with this approach. But I must admit, I like the time and effort you put in your tutorial/help signs.
PS: Of course I would like your rating on my game as well ;) https://itch.io/jam/gmtk-2019/rate/460633