If you are getting value out of Gophercises I don't see any reason why the web dev course would be out of your reach. There are definitely exercises in Gophercises that are much harder than anything we code in a vast majority of the web dev course.

The only thing that might make the web dev course harder is the fact that we end up with a much larger codebase, but none of the individual code is significantly more challenging in any way.