Red Balloon Security interview questions

I reached out to the company, indicating my interest in a software development position, by searching their careers page. I received a response from a "mystical job-granting robot" which sent me a 2-part coding challenge. I answered both parts of the coding challenge to the best of my abilities and received an email about 1 week later indicating that they would not be moving forward with my candidacy.

Two challenges were given. I solved both of them and also responded with changes to their review comments. The puzzles are interesting and challenging. However, their expectations are not clear. Even though I solved the puzzles (and I see that others have experienced the same), they are unwilling to move forward. It’s strange. Also their communication is odd, I was notified by some sort of automated system and that email went straight to spam. A little respect for the candidates, by more humanly notifying them, wouldn’t hurt them, after all significant time is spent by candidates on the puzzles