Oneeyed and I have this game. In fact, we've played it together a time or 2.
I am surprised you don't still play it with him. This is more your type of game (the jumping, the skill, the parkour) and his type (the levelling up, the finding materials and crafting better weapons and beating the crap out of zombies). I get way too frustrated with these types of games. I ended up giving up as it is now 3am and I need sleep. I will play next time he comes over and helps me to know where to jump to and where to go next. I am still in the starting area ... not even level 3 yet .. so I can't play with anyone so he would have to come over and show me.