this is a very good game!
the way that it introduces the mechanics and progresses in difficulty is perfect. The main mechanic and its implementation was done well. I loved the short story that you integrated smoothly into the gameplay. The puzzles where a decent challenge although it was sometimes hard to tell what was going on with the bridges. the only issues I had was with the jumping. there's a mechanic called 'coyote time' that is often added to games of this type, its basically a few frames of grace where the player is no longer on the ground but can still jump. I think if you add that, the movement will be a whole lot more satisfying.
the character sprites look great and it pays off because the focus is on the player. the environment could have been a little bit more decorated but that's not a big issue. the music is perfect for this game.
well done on completing your first game jam! I hope you do more jams because you have a good understanding of game design and you are only going to get better :)
+1 star for using my fav game engine.