The most direct implementation of what you want would be:

  SELECT (Table1.id, Table1.name, Table2.level, Table2.table1_id)
  FILTER Table1.id = Table2.table1_id;

(This has a somewhat annoying extra output of table1_id, which could be projected away if necessary.)

If you want to use edgeql's shapes but still keep the essential join flavor, then something like:

  SELECT (Table1 { id, name }, Table2 { level })
  FILTER Table1.id = Table2.table1_id;

To make it a little more concrete, you can try this on the tutorial database (https://www.edgedb.com/tutorial)

  SELECT (Photo {uri}, User {name, email})
  FILTER Photo.author.id = User.id;

The tutorial database uses links, and so instead of having an author_id we have author.id, but having an author_id property would work just fine---except that then you'd have to do all the joins manually.