A fair point, but Minecraft also got around just by the word of mouth.
Sortof true, but completely undersells the truth of the issue.
Minecraft did about as well as Aquaria has done,
up until Penny Arcade advertised it heavily by making comics/newsposts devoted to it, and THEN it took off and became wildly popular.
Aquaria has just been largely under-advertised, you might notice
it never got a mention on a massively visited site like Penny Arcade, much less a comic made about it.