This is a very simple and enjoyable game and would make for a great mobile game.
My biggest problems with the game is in its UI elements. For starters there is a lot of wasted space. Everything on the left side of the screen is simply not used. So why do you have it? Same goes for the entire horizontal middle section. Yes it is there to seperate the two zones, but the space in between is so large it is essentially a big distraction. Needing to force my eyes on two completely different sides of the screen. Making the game much harder then it actually is.
The highscore being so obviously flamboyant in the middle of the screen is also another huge eye sore. Which to me screams that the only reason that it is placed there is to fill up space.
The gaps in the road are a bit hard to see and for my bad eyes I would love it if they stand out a bit more.
In my opinion the rope should either be always used or never used. To me it feels like the only reason it is implemented is to stick to the theme of the jam. Furthermore I would have expected the rope to always be there, even when not jumping. Because everytime you jump now the rope spring out of nothingness.
And last for jumping. Jumping up is almost immediate. For a game that requieres tight controls this is perfect, however falling down is down with gravity. This makes the incredibly otherwise tight controls really watered down. And makes it much harder to achieve high level play.