Heya! First of all, I love the concept. I think it could make for a hit, but it has it´s problems. First of all, I´m not an Unity user, but for what I see you are making the jump with different heights by changing the gravity dinamically. This looks weird as that´s not how gravity looks irl.
Jonas has a great video on that with some code explanation :DAnyways, back to the game. I really liked the narration at the beginning. Did you make that yourself? I like the characters, they are cute and unique. I didn´t understand that much what purpose the sad girl one had, but she was cool too I guess. It gets a bit annoying the fact that you have to start from the beginning, but I understand it because it´s a demo and you didn´t have much time. Those "jump, be brave" messages I think would´ve fit better if they were said by a character, but again, 1 week.
Overall, the game has a lot of potential but it needs some improvements in terms of game feel and graphics. Well done! :D