Compared to the version shown in this walkthrough the version uploaded here has some bugs:
1. Course 9: I got the 2nd star first. After that (maybe even also before???) it was impossible to get the 1st star. It was brown, and when I got it, the number of my stars didn't increase, and the game told me I had got the 2nd star again.
2. Course 13: I can't get the 1st star because the bumper on top of the cliff is missing. And that's why I can't get the 3rd star, too (because you need to choose the 3rd star for getting it).
3. Darkness Destination (order of the stars = order in the youtube-walkthrough):
- I can't get the 2nd star because I die before touching the bottom.
- I can't get the 3rd star because the music block on the chimney is missing.
- I can't get the 4th star because it's brown ("already got").
4. Skyway Kingdom Castle: There are also red coins in the 2nd part, and the star appears in the 1st part. But there is no way back except the red-coin-resetting way through the switch palace, so I can't get the star.
5. There is no way back from the last overworld except pressing start and choosing "exit course" in course 15 or Skyway Kingdom Castle.
One more difference: I got both stars from the 1st rabbit.
Please upload the fixed version also here.
I like the game, maybe especially the later courses could be more difficult.