Heh, that's pretty interesting.
As far as game mechanics go, I don't see much resemblance, so it must either be a different kind of link, or a Spelunky fanboy/girl put it up there while high.
It's possible that the creators of Terraria did in fact take some inspiration from Spelunky, however.
[Kinda Off Topic]A game I've been watching the progress on that's quite similar to Terraria is
King Arthur's Gold, which had it's first open beta released before Terraria was released, and so was quite disconnected. However, any further discussion along this line should be moved to a topic outside of the Spelunky board.
