You kept dropping hints about "what happened last run" and "I know how much you hate doing these, but I can't thank you enough," to the point where I was expecting a big twist. And then the game looped. Which is actually the perfect twist.
If you make a larger release, please consider reinforcing that twist with elements that encourage replayability, such as a high score/best time tracker, optional pickups, random level generation (ambitious), maybe even a "Groundhog Day," "escape-the-loop" sort of narrative.