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Are you sure it really charged your $19.95?
I've bought a game that was on sale once too and when I look at it under the "my purchases" screen the original price shows up in one column (all the way to the left) and what I actually paid for it shows up in a different column (sort of in the middle).
Check it out and if it turns out you did pay full price I would contact customer service. The date of your purchase also shows up so it will be easy for them to see that it should have been discounted.

Good luck!

I like that game a lot too - I find it relaxing :)