At 24 chapters long, and 61,063 words total, this little ditty should take somewhere around 5-7 hours to get through. It's a tad shorter if you skip all the TIPS though.
I'll do another read of it sometime in the future to iron out any remaining bugs. I'm sure I created a few tiny hiccups when I rearranged a few things. Nothing too bad should happen though.
Linux and Mac versions are also on the way, so stay tuned!
As for the sequel, I've already started writing the first chapter and will be uploading the game page soon.