Aria - needs more legato! A lot more legato! And I think you should experiment with making the trills lighter than the main melodic notes. They are too heavy and get in the way, and also detract from the essence of the legato. I think the left hand also could use more texture. He notated it , true, in a way that was conventional to the Baroque, but I think it still means something.
Variation 1 - You play twice as fast as the aria (eighth notes of the aria = quarter notes of variation 1) but I think you should experiment playing the aria faster, and having the quarter note be the same in both movements. Do I detect a hint of Gouldisms? One of the things that made Gould so impressive, though on the surface it may sounded like he played everything the same (one otherwise knowledgable pianist friend of mine said it sounded like he played everything on the typewriter) , is that he gave everything such an amazing note-picture, or a mental image of what the music looks like. I think you could use more of this in the sixteenth note passages especially, and in the left hand as far as the texture is concerned. Sixteenth note passages should be heavier here, lighter here, as you want to make the phrase; or heavier here, lighter there, as you want to express the registers. Think about it! It will give your performance more character.
Variation 14 - Don't forget that Bach wrote staccato marks in the little trills that go up and down the keyboard. Don't hold onto the last note.
Variation 19 - It was so weird I didn't recognize it for three bars, and I play the damn piece. Oh well; as you wish!
Variation 20 - Sounds a bit sluggish, not the tempo but the articulation is heavy and undifferentiated. Lighten up dude!
Variation 26 - I can't see your hands up close, but I think another kind of touch would help you play this one lighter, easier, and more buoyant. Experiment in the moving triplet passages with a stroking touch, or as Beethoven's approach was called, "dusting the piano." If you happen to have the DVD of Gould playing these, you can see very clearly he uses this touch in several of the fast variations (number 5, number 14, number 26 according to my memory).
Looks like you have good fingers!
Walter Ramsey