One thing I have been considering is roaming enemies, will definitely think about adding them.
That would be a great improvement on what is already a very interesting and original concept for a game. It kind of reminds me a bit of the old Wizball on the C64/Amiga, but a lot different.
The jumping physics seems a bit odd though, doesn't quite feel right. Also, I seemed to stick to the side of crates some times, not sure if that was intentional.