I love the splash image you created for the itch page. It's very stylish. I also very much enjoyed the physics on the cube and ball, both of which worked well with the slow rotation of the tube.
If I may make a couple critical comments... You start the player out facing away from the challenge to be completed. Was this intentional, as a way to disorient us at the beginning of the game? Additionally each level feels too long and very same-y. It's often hard to strike a balance between length of level and variety of activity. You want to give a player a good taste of what you're trying to do in a given level without giving them too much of the same thing. A meal composed only of white rice is boring, while a spoonful of only rice (i.e. some of the same thing), or a meal made of rice plus a topping (i.e., variety) are both better. I hope my analogy makes sense ^^;
Regardless, congratulations on making a working game in such a short time frame!