So I really love the artstyle and the way you tell the story is really cute, maybe you can add sth more to it (like what the brother wants the carrots for ultimately, f.e. you see a carrot cake for the mother in the end or sth like that)
At this point I don't know what happens at the end, so I am sorry if exactly this is the plan and I just happened to not get to it haha
So I think 100 carrots is actually a LOT, I only got to 33 or sth like that.
Also it's pretty hard to win because the jumps are really long and you eventually end up in a chocolate stream without actually being able to do sth against it. Maybe just slow down the map a little or implement a double jump so that one can safe themselves. That would really help so that the player doesn't get frustrated too easily :D
And I think that the map sometimes get's really repetitive, I have seen the hill with 5 carrots like 3 times in a row haha. And if you want to invest more time into it, it would be nice to change or put some decorations in the background that are coherent with the platforms in the foreground.
That you have made this in only 3 days is amazing on it's own. Congrats!