I don’t see much activity here and github has not been updated in a while. This project looks promising but if small issues not addressed and slow updates than best to use something else. I don’t want to start a project and hit a wall with an issue that is not being worked on anytime soon?
Project Status?
Thin is very much alive! We’ve e.g. just recently shipped improvements to enum type generation (see Can't create records using enums - #2 by mpscholten) The last weeks have been a bit slower than usually as we’ve been focussed on IHP v1.0 launch 
In parallel Thin has had a lot of growth the last weeks/months, that kept us busy as well. But things should get back to normal now.
Please ping me in case you see something critically not addressed fast enough.