Nice, cute drawings. I guess you do have to consider whether this is a game where you solve the grid by matching all the bums to the heads, or one where it's the most matched, or maybe some other system, and that's where the creativity is! But this sort of thing is what jamming is about, testing an idea, getting feedback. Good start for a first jam. The most important thing you should do is a retrospective of your own, make a note of what went well, what didn't, and how you can improve. It will help you identify how to get better at games dev (or maybe just jams!), and identify blind spots or unhealthy approaches. The next most important thing is to enjoy it and not get stressed by it. The only other thing I'd say is to bear in mind how busy it gets visually once a number of tiles are placed, and how someone with colour blindness might see this game. Over time and with a proper goal, it probably wears out people's eyes scanning around the board.