Lovely short story. Disappointed that it ended so quickly, but completely understand with the time limit! :)
One thing that I did have an small issue with, was that in the first level you didn't have restrictions or any guide where to go. I ended up thinking that you should follow the line, and went FAAAAAR until I was like "I'm done, I'll just go up a bit and see if there's anything there" :D Thankfully there was, BUT then I had to go aaaaalllll the way back for the portal! :D
Music and SFX would have made the game a lot better as well, at least some nice quiet background music would have fit it perfectly, to even more get the player into the story! :)