Wow, this was a great game! It's mostly because it's a game where you really have to think outside the box...and I mean that quite literally! I was impressed at how far I got. Dang, it's a shame people don't agree with me. I've really never played a puzzle game like this. You just have to think more and more.
The first level that got me stuck was Level 8. I thought you were supposed to on the platform above the jewel. Don't do that! Just keep the block on top of you. Sometimes I can't even remember what technique I used to get as far as I could before failing and had to start over.