Planet of the Infinite Minds is a fun game consisting of well-done abstract puzzles and less-well-done wordplay ones. Its ridiculous story shouldn't detract from the the experience if you don't take it seriously. Overall, it's a great example of doing puzzles using non-conventional rooms and objects.
An unusual example of a Twine game which has good points, Rites of a Mailmare is little more than an excuse to show off some pictures. They are well drawn.
Although it should be a 2/5 by normal standards, it a 5/5 by Twine standards, hence the rating.
It is an interesting experiment in using objects to represent and communicate with other players asynchronously. If you're interested in exploring and editing a mostly static world, it's good.