Since you asked for feedback: I think it would be better to introduce the player to one powerup at a time. Design your levels around each power up. then more complicated levels with multiple powers. this teaches the player how to play slowly. The first level didn't need the shrinking apple. Some indicator that you are powered up would be nice as well. The first time i ate the gravity apple i didn't know anything happened, so i went and ate the smaller apple and got stuck for a bit.
Really nice idea on the menu with the apple falling, great detail! Congrats on your first game jam, nice job!!