The Bleeding Tree

The Bleeding Tree is a roguelike with a unique twist on replayability. Whenever you play, whether you win or lose, you leave behind something to find in a future run.

If you die during a run, your character becomes a ghost that will linger in that level, waiting to help you next time you come through. If you defeat the final boss, your character becomes the final boss.

And in both of these cases, you also leave behind all the powers you have collected along the way, making the ghost and boss just as powerful as you were.