nice job, there are some things to keep in mind for your next game: the relation between the sideways speed and the falling/jumping speed feels off, either slow down the player, or increase the gravity and jump speed. Also, the sides of the platforms are very sticky yet there's no where to go from there, you could add some sort of ledge grab or wall jump feature, or just slide down faster.
But, of course, it was a fun little game!