(Review of the original NDS version, which didn't include the flow chart feature)
The puzzles are fun, if a little too simple.
The concept at the center of the story is great, but good luck getting all the endings to see the whole story. There's really no logic to which actions lead to which endings, so you'd better just look it up.
The gap between the gameplay and the great premise is the most disappointing thing for me.
More detail and comparison to Danganronpa on my blog.