This game isn't TOO bad, but i still find it not good.
1)Too slippery - koopa is very slippery when fast, and you need speed a lot.
2)Bugs - there's many bugs, for example when i'm doing all dolls on first level, i can noclip into wall with big coin and fire flower, and can only return with a door, which AT LEAST skips Mario guy.
3)Bad desigh, can't say much.
4)Badly hidden 10 coins.
I would put 2 stars, but game is too fun even nowadays to not be two and a half.