Thanks for playing it and trying it out! I do have plans to update the game and make it downloadable, and fix the save system, and turn it into a more proper demo or chapter 1, and possibly even more content beyond that.
In its current state, depending on how fast you read, if you take your time, or if you listen to the audio at the beginning, the game can be completed in as quickly as 15 minutes, or at most around 30 minutes for a slower play through.