Neat little thing. The music is very visual novel-y. And I thought the story was a nice compact thing.
When I get an ending, I wanted to see how many other endings there are, which ones have I gotten, etc. That's what I thought when I got the ending deleting Diamond's information. But then I also had to sit through the opening again. It would be cool if there was a "skip text you've already seen" feature like some VNs have.
The ending was a little abrupt, though! Square won the contest and then less than a minute later they've left the apprenticeship and are a failure again? Oof. Ha.