Hey, from someone who wrote mostly positive comments, in my eyes, a GameJam is not a proper playtest of a game.
when I'm rating a game I prefer to comment on the positives and things I really enjoyed about the game.
We came here to have fun, and celebrate the making of games.
I'm always happy to give feedback when asked and I gave some when it was very needed, but for the GameJam i preferred to keep everything as positive as possible, and to commend people's amazing and hard work over the course of only 4 days, and not a full development cycle.
Getting too much constructive criticism in a GameJam where you can't update and fix things can leave some people to focus on what they could have done rather than the amazing accomplishment of what they did.