After 16 video's (around 20/30 minutes each) is the video walkthrough done. I recommend to never watch a walkthrough, but it is just in case you are stuck:

https://www.youtube.com/playlist?list=PLOqRKNAEkU9HJz_Z8POqipYts6zysmEG7

I truly hope more people are willing to try Twell. If you like adventure games with puzzles, you might gonna like this. It's free and available on Steam.