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There's All Things Devours for 1).

DF is getting what I hope will be a Single-A 2D release on Steam sometime soon[1], in case you weren't aware.

I like your thinking, though damn that would be one hell of a project.

The Stanley Parable somewhat resembles 3. The end is never the end is never the end is never the end...

For Groundhog Day, have you played The Forgotten City? While not a simulation, you do relive the same day over and over.

For time travel, exploiting quick save/load is a sort of backwards time travel.