I don't know, it was worth it to me personally on some level, but not as much as I wanted it to be.
Hmm, I guess I could see it your way. You really didn't think you accomplished much? Was it due to the numbers of sales? Probably not, but let me tell ya something bro. A good number of the gamers nowadays (sorry if this is a generalization) are a bit more into the violence games (which is ok, but there should be a nice balance) than deep thought story telling games like Aquaria. And that's a sad observation(fact?) in my opinion.
At first glance this game "may" look a bit kiddish, but it really isn't. It talks about life. It talks about peoples mistakes and the outcome of them. This game really has a deep deep level of thinking if you sit down and think about it. And to me that's a rare gem in the swamp infested game industry these days.
You know I may be spinning wheel or rehashing things many have said. But for what its worth, you guys did great with this game. I would gladly take it over any of the first person shooters coming out there.
My question to you overall is: What "is" worth it?
Oh and good luck with those other games i've read about. I'll keep an eye out for them. 
Mt two cents.
I've gotta agree here.
Aquaria is something truly unique, stunningly beautiful and amazingly haunting...sadly most gamers won't even budge from their recliners if a game doesn't have half a ton of blood, and twice as many curses...i'll be honest, when i first saw Aquaria, i thought "Hmm...that's kinda neat..." Figured i'd pick it up, see what it was about. Never expected it to be...so stunning. In f act, it's revitalized my faith in Indie games. Even if it wasn't as good financially as it could be, Aquaria is something well worth exploring. TIm Schaffers Psychonauts was disturbing, fantastic, and amazingly funny...it sold incredibly poorly, but he still hopes to make a sequel. I guess what my long spiel is trying to say, to Alec, Derek, and all fans, is that we shouldn't be swayed by sales numbers, or any of that. You put your heart into the game, and it's one of the best i've ever played. I'd be really disappointed if a sequel never came...I'm keeping the faith for a sequel. If you didn't think you'd accomplished much, just look at the forums...how many thousands of us are waiting for sequel? Those are all lives you touched(okay, i'll stop before i get sappy here.)
Side note to Alec, I'm keeping tabs on your work. Heroes and Villains is neat and all(not so interested because i lack an iphone), but i'm really interested in seeing where you might go with Marion. You've got a real talent for storytelling. Keep at it.