Have you installed the game?
You have to install the zipped file then extract it and open the .exe file
Thats strange, the sensitivity is fine on my side.
Yeah the jumps are quite hard and annoying, I quickly mashed up some levels as I only started making the game with around 1 day left. The jumps are possible with only pressing w and space, if you move diagonally and do some bunny-hopping you can gain more speed also.
But thanks for the feedback! Ill definitely improve the next time I join a game jam!