It's hard to rate a protoype which I couldn't beat. You have to work on performance if you want more player to enjoy you project in the future. I believe it's impossible to precisely maneuver from star to star in less than 20 fps.
You also need to change first level cuz to beat it I had to jump around and climb over the wall to get the second block. If I put the star on the pedestal just as the game wants the door moves slightly and it's impossible do go under it, especially without crouching.
I am sorry I can not tell more but this is as far as I got. Good luck with this project, I see some potential if you work on performance and on level design