I like it.
Simple background means that there's not a lot distracting you from your target and you are clear where the edges of platforms are. I wouldn't change a thing, except perhaps a level select. Redoing the same level about 50 odd times over because you just can't make the jump can get frustrating. Beat it in the end, well done. Controls work perfectly.
Only complaint is water rooms with big spinny red wheels. That's very computer intensive, as in surprisingly so. Game slowed right down for that.