Terraria 1.2 patchreally improved the game, it almost like a full expansion... and it's free.

X-Com expansion, cool as it is, give me 2 extra enemies. I mean, enemies are the bread and butter of a strategy game. How much replay value can I get from just 2 new enemies? And cost 30 USD...

I will play X-Com expansion... eventually. And I will play Terraria now.