(I wrote the original version of this review in my blog upon this game's initial 2013 IFComp release.)
100,000 years is a sci-fi Twine piece about galactic-sized spans of time. It is easily worth any comp-goer's time to try as it is very short. I almost said "ironically very short," but that would have been silly as the smallness/largeness thing is obviously a feature.
The goings-on in a chunk of the universe are described in a few lines of verse. Clicking the left arrow takes you 100,000 years into the past while the right arrow takes you the same distance into the future. Changes over that time period are then described, but the arrows remain, ready to move you forward or backward again. The result is a tiny existential text toy. What you discover if you go far enough in either direction is equally likely to make you feel more a part of the universe or just less significant. The achievement of 100,000 years is that it can touch on those feelings quickly and with such a simple device, though the whole piece is definitely short-lived.