This is not bad. I'm not really into the idea of rolling a ball around but I thought I'd have a play. You've got a nice landscape with several puzzles in one place and once you get used to the mechanics of rolling the ball around then it does become easier.
I was trying to collect the coins to go through the door and though i'd see if I could click on it and managed to roll through the door which, although I don't think is intentional, it allowed me to see what was beyond and it's a nice big playing area. Do you plan to work on this further DEV.Regards