What's the problem with the jumping? Also, the other problems are simply that I didn't have time to make what I wanted, which was a bunch of nice-looking rooms that have doors that open when you complete the challenging puzzle inside.
You kind of have movement in the air, but then don't and in general, I found it extremely hard to jump on a box unless it stands in a corner. Also, I experienced a bg where when jumping you could get stuck on the surface of the wall.