Thank you for your comment! Yes there are some technical errors that we discovered after we exported the game so we didn't have enough time or a chance to fix them.
I don't know why you encountered problems with jumping and in the ending because the rest of the people and friends who tried it told me that they didn't encounter any similar problems :/
Anyway, this was our first game jam so we will pay more attention to these details and repairs in the coming times :)