Great idea to make you think strategically about how to optimize your run through each level. The star as a reward for being more efficient is a nice touch. 

minimalistic but very good and sweet game.. 

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 

(The HTML5 did not work for me ) It was enjoyable playing through the levels w/this minimalist mechanic! well done 

Very nice! With more levels, it can really be a hit!

I Like the game :) Good Work. Very clever

Very good game! I like how limiting the player to one jump made you have to design an alternative way to get around; hugging a wall to climb it is a very clever solution to that and worked well! When I was trying to think of ideas at the start I wanted to do something similar but instead of jumps it was only being able to pick one direction you could move but it just didn't seem to work that nicely because I didn't have a something like how you have wall hugging to still allow the player to do enough stuff to make it interesting.