I will give some opinion:
1. PB and Jay should have the different abilities that support each other. Jay as the destructor,while PB as the healer...(maybe about healing broken path),PB jump higher but not so far,while Jay jump farer but not so high,etc...
2. Make a "day" background. Most of your game using "night" background by choosing black. Thats too monotone i think,you should use something new.
3. Where's the music?with this kind of game, RnB or trance is more suitable..
4. Make arrow or something to show us where should go. Since this is a platformer, adding some checkpoint is a good thing
5. Good luck