I would quibble with where you put the squiggly lines.
The very first step, what you wrote implies an aldehyde rather than the acid. Move the line to the C-O bond to give an acid and a "C+" unit as retrons. You therefore need an alcohol and an acid.
The second point is the Diels-Alder reaction, are you sure of the regioselectivity?
Otherwise ok. My points are really minor.