Fugue with a theme similar to the musical offering

I would like some comments regarding the harmony and the chromaticism in the piece.

I do not have the sheet music to the piece. 

So far so good imo.  The only spot that sounds weird to me is at 0:29 in the counterpoint.  What you have here sounds like the exposition to a 4-voice fugue but when it's time to write an episode you just end it ... ???  Maybe you're practicing writing fugue expositions with well known fugue subjects - if so, that is a very useful exercise and I totally support your endeavors!  Good luck!