Overall a fun game. Last level was a bit too hard. Fifth level was my favorite and a clever use of the mechanic. I also learned from it how to wall jump. In the case you don't know how to do it
How to wall jump:
be next to a wall with jump facing the wall
1. Detach jump
2. move closer to the wall. (just hold the button during the entire thing. this step happens pretty much instantly)
3. join the jump piece so it is inside the wall for a very short time
4. Jump right after
the jump piece retains the falling velocity so the next consecutive wall jump will be harder depending on how much time you spend in step 2