While the idea is interesting, it could use more developing. At first is very confusing about what to do or why am I losing. But understanding the objective doesn't really improve the gameplay. The music is too repetitive, the sounds don't add anything and neither does the art. The changes in the color of the gem you have to click passes by without notice, and I couldn't really spot how much gems I needed to get to keep playing, or if clicking in the wrong ones gave me some kind of penalty.
There were times when clicking in a gem that was going over another one destroyed the one below.
I got to stage 5 or 6 I think.
Anyway, good luck, hope you improve it