Well, Reise was before GOT so it's not fair to compare it to that, and it's got some steampunk elements that you wouldn't find in GOT from what I've seen. I haven't tried it yet, but they do have it as a movie on Netflix. I don't know it was actually edited together or if they just have all of the episodes playing back to back though.
If you're looking for another good web-series, the recent Mortal Kombat: Legacy was actually pretty good. I've seen the first 6 or 7 eps, and even thought I know nothing about MK I was able to really enjoy each one. The only real problem with it is that it basically just sets up the characters' stories for the games, so you don't get a whole lot of closure on the different storylines.