I found this to be quite challenging, and was unable to completely finish :(
I think if you were able to control the jump height depending on how long you hold the jump button, it would be good. There were times when i felt like I was jumping too high in order to fit through a narrow passage, so having an option to jump a little shorter would be awesome. Also, adding some coyote time would be helpful too!
As a side note, I've noticed this is the first game uploaded on your profile—if it's your first game jam, congrats!!! Completing a game jam is an awesome achievement that not many people can accomplish :)