Tried the demo and got to the boss with 4 items collected. Don't know if the boss can be killed? He seem to be impossible to reach because you can't jump there. The game is insane difficult. So I hope you making it a lot easier.
But it looking good so far. So good luck and hope you will finish it and not just making one level or so. Like many other people
I see you are using BB too. Thats cool