I've played through the entire game several times so far. My times have been around the dev's time (dev time is 1:20:00, I've gotten around 1:25:00). So, to actually speedrun this game, I went ahead and spent the last few weeks making routes for this game: http://pastebin.com/w0W84q6B
It took quite a while since there are so many levels. Plus, you have to make sure the routes are viable for a full-game speedrun (as opposed to IL). I'm currently taking my notes and making them into videos: https://www.youtube.com/playlist?list=PLr26ZL5CAdZWvhHSFD3-DbqLybfuJVaQc
As I'm going through and making the videos, many levels I've updated the routes so they are easier or faster than my initial route I had in mind. So, keep watch as I upload videos. I could always use feedback!
Additionally, especially in the later levels, I do make sure to hit checkpoints as those are invaluable if you make a mistake, which happens for many reasons in this game. I'm estimating sub one hour for this game. I'm sure after running these routes, I'll refine the routes more and slowly reduce that time.
Once I get to the run phase, I'll be streaming it on my Twitch channel: http://www.twitch.tv/demonstrate86/
Looking forward to seeing who else might want to get involved! :-)