Of all the rogue-like games I have played, none have matched the depth of Binding of Isaac. There's countless items to unlock, unlimited synergies between items, tons of unique characters, and of course, challenge. The Repentance DLC changes up the game a lot. Aside from all the new content, the DLC also balances the game into a state I would consider much harder that Afterbirth+. The amount of time and skill required to unlock everything in this game alone warrants a buy. It is definitely worth the money.