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!