Hey brother, I'm glad to see you here, indeed Terraria is a good video game, and it is as you say, in the game there are things that make recerencia to the same MC, unlike this has bosses that are very difficult to beat, but the complexity in each of the adventures that we can find here is very tremendous.
The corruption is the one that is purple, and the crimson is the red, the red is actually meat, a great brain like enemy boss awaits us in that place, but honestly the most complicated is the corruption.