Thank you for your feedback! I'm glad to hear you like it.
This is my first jam game, and I had great fun creating it. As for the file, I was not sure whether it was better jam etiquette to make it downloadable or playable online (the former makes intuitive sense as someone using the same engine, Twine in my case, might be curious to see how exactly the game has been created). I checked the page with other submissions, and most were downloadable, so here I went. And then it was too late to change.
I agree that the time may be way TOO pressing. After the jam, I'll be adding difficulty levels designed so that most people have no trouble playing at Easy or Medium. And the current math and timing will be Hard :)