Dont get me wrong, its great. The blueprints are easy to comprehend, the app itself is pretty good.
However (and this is gonna sound really salty), whoever fashioned those controls is a soulless serial rapist. They are unresponsive and annoying. Not to mention, ledges are slippery like butter and walls cannot be jumped on if youre walking into them (it forces you on or into the ground). At random intervals, the game will throw you five hundred feet in the air for no reason.
Basically, use the blueprints and such, not the game. Otherwise, youll walk away with serious brain damage.