I ran across this on Temple of Roguelike and thought it was kind of interesting. They're doing a very standard Seven Day Roguelike Challenge where you come up with a concept and you have seven days to make a playable roguelike. While that in and of itself is neat, one of their users, KhaoTom did this:

Idea:
When you are about to die, a new timeline is added to the stack. When you solve a timeline, you pop it from the stack and continue the previous one, but with your latest character stats and inventory. For balancing, the maximum size of the stack should be limited, and game over occurs when dying with the stack full.

Oh also your character is a Magical Girl.​

You can play it RIGHT HERE for free, in case you missed the above link. He scaled back the original idea, but it's mostly in tact from the concept. The only difference is that you can't die any more.

Pretty crazy what comes out of these contests. It's a very novel idea for a CRPG. Captain Picard would agree. Making it work in seven days is also pretty amazing.