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When you defeat an enemy, you get a blue crystal. If the enemy kills another enemy while it is sliding, you get a green crystal. You also might get a combination for killing more enemies - say, two blue crystals and 1 green crystal.
There is also a big crystal that falls down when you have made a super achievement - it was was green. When it falls and Igor catches it, Igor jumps for joy. If he misses, he cries.
In the learning version, there is a yellow crystal which you can find in the secret room. This is probably a reward for finding it in the first place. Learn more
Here is a list of the crystals and how much they are worth.
Blue: 500 pts
Green: please tell us in the post
Big Green: 10,000 pts
Yellow: 8,000 pts