Oh Shadestache! I know your situation may seem hopeless, but please don't think that they've forgotten about you. Though the interview may have not paid as much attention to you, I'm sure they'll still give you a fair chance as the other candidates, and it sounds like you did well on the other tasks. I'm sure you'll get in!
I'm not so sure about the "fair chance" part because a large part of it will be the interviewer's opinion. They could be like, "This student was amazing and passionate" or "This student was alright, though it's not what we're looking for."
Ugh. I feel as though I talked about being versatile too much. I said that I was good at academia, sport, leadership, etc. I'm not sure if they're looking for someone who's like this. They might think I neglect science or something :\\
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For the puzzles, they're not entirely maths driven. I would say that it's more logical, so don't lose hope.