Thanks for the feedback. I don't know if I'll add any changes to this game considering that it was made for a game jam (maybe I'll do a full release version). You can stop your momentum in air but not if you're moving too fast . Try just tapping W while making small jumps. You can also turn in midair by turning your mouse (as you noticed). A combination of these techniques should be able to get you up that staircase. I promise it's possible. Both me and someone who tested my game were able to do it. Thanks again and I will definitely look into increasing midair control if more people are having this issue and/or I decide to make a full release version.