Congrats on your first game! :D
I really like the concept, and I think the execution was pretty well done for a first game, though it did get a bit finicky at times, like with scaling to move the box (had to be pushing against it before going to the proper scale in order for it to move, and even then the distance it moved was inconsistent), and knowing to be the right size before casting a spell on the spike (that boy can *shmove* lol)
Some platformer specific notes too, look into adding a coyote time and jump buffer. They add a lot to making the platforming both more forgiving and better feeling for the player. Great job overall!