Bootstrap

Bootstrap is a single-player time travel puzzle game.

The primary gimmick is how paradoxes are handled during time travel. Past versions of you must see exactly what you saw, a future self can't interfere (at least not directly) with them. 

This game features challenging puzzles, even by the standards of time-travel puzzle games. All puzzles are logic-based (meaning you have perfect information about the level, there are no "hidden doors"), and the the game is turn-based (no physical dexterity or timing is required.) 

The art in the game is mediocre (I made it in mspaint), there is currently no sound, and there is little semblance of a storyline or cohesive world-building. Bootstrap is really just about solving very hard puzzles, and your primary reward for doing so is harder puzzles.