Agree on the two columns. Either add more text so it's clearer it's in columns, or tweak that in some way. I accidentally jumped the column in the print section. I'm not sold on the 'skills' only showing on hover (not sold on skills as a general whole in any website). The parallax is a little disorienting and makes each individual chapter feel very disconnected. Maybe something along the side that tracks progress, kind of like an in-page navbar or something.
Also, that navbar could definitely show at first and then drop out on hover. I agree with Stefano about the clicks.