I have now purchased Aquaria three times.
First, I purchased it through the site.
Second, I purchased it through Humble Indie Bundle 2.
Third, I purchased it for the iPad.
Some would say it was silly for me to bother buying the iPad version: I'd already been redundant when I put money toward it in HIB 2, and this third purchase would be redundancy atop redundancy.
I would say that Aquaria's icon on my iPad desktop makes me feel more like I have a reason to own the device. I'd set aside a place of honor for the game this whole time.
I'm so glad that Aquaria has already jumped up to 9 on the "Top Charts, Paid Apps" list. If newcomers see it, they might buy it and keep it visible. Also, I'm amused that the game has an official "rating" now, 9+. Glad to know I can give this to my future kids! Lastly, I'm simultaneously glad/amused that I got a review in there quickly enough that it's floating near the top of the review pile. Whew! Gotta give a good impression.
--Delmion