I finished VIM adventures a few years ago and found this approach quite helpful to improve my VIM muscle memory.
What's very unfortunate though is that the licenses are limited to 6 months. Occasionally I wish I could go back to one of the levels focusing on a specific feature, but paying another $25 every time just seems excessive.
Yeah, I loved the intro but balked at the cost as well. I'd happily pay a flat $30, or $10/yr, but $50/yr turned me away.
Really, I'm not sure it's worth it for me - plenty of other good sources of entertainment, and my vim skills are already solid. If the rest of the game is the same quality as the intro, there are plenty of people it would be worth it for! But... I'm not sure they realize it.
What's very unfortunate though is that the licenses are limited to 6 months. Occasionally I wish I could go back to one of the levels focusing on a specific feature, but paying another $25 every time just seems excessive.