Really cool! Love the artstyle and the concept. Reminds me of a level in VVVVVV when the same "looping" applied.
A bit of feedback : you should be able to jump when you fell down a platform, right now it seems like you can only do it when you are on the ground. Also, the projectiles should inherit the speed of the character (for example, when on the elevator, right now they go straight left/right in world space. Usually they would also inherit the Y speed of the character)