Terraria is great, I love that game. It's like a 2D Minecraft, but not as pointless. I'm not trying to insult Minecraft, I love that too, there's just a lot more of a game to Terraria.
So what have you guys bought up until now? I'm wondering if it's smart at all to wait until the final day, am I sure to get the best of the best deals that way? Right now, I just bought Castle Crashers and looking into buying FTL. Any other recommendations I can get from you guys?
Traditionally the last day of the sale has just been repeats of the most popular sales from previous days. If something is a daily deal, or a flash sale, or a community vote, that's as cheap as it's going to get.
FTL was on sale for 2.50. It might repeat that sale on the last day, so it's probably worth it to wait until then and see if it goes on sale. I bought FTL for full price, though, and I love that game too. It's very hard and unforgiving, so you have to go into it expecting to lose. I've played about 32 hours of it, and I haven't won a game yet. I'd say it's worth it, but I'm a huge sci-fi / Star Trek / space battles in general fan.