Awesome game! I came up with a similar idea for my game jam submission, but yours actually has a good number of levels! The ragdolling into the finish isn't super intuitive, but otherwise a really fun mechanic.
The number of levels reminds me of the Portal 1 Demo Portal the first slice, but it has 10 levels not 9. But that is what makes this more like a portal mod. If I were a good coder I could make this a portal mod but i suck at it so i wont.