I liked your story, if I missed the first little bit of it, it could easily have been about a science camp for kids, and enjoying the last bits of free-time before parents come to pick them up. it may give a little more heartwarming, and a little less bleak, but thats all in what you are going for.
I suppose you picked your colors to be sunset related, and I found the contrast was not high enough to read the letters, and the pink was generally irritating on the eyes. I would recommend darker text, and a less saturated pink.