I like it very much, one of my favorites from WTC. The prelude has the right feel of being a miniature concerto grosso. I don't think your tempo is necessarily too fast, but it does feel a bit rushed. I think if you let phrases end with just a microsecond gap before going on to the next phrase, the whole prelude would feel less anxious and more spacious, without sacrificing tempo. I think the fugue is very good indeed, the only thing I can think of is that you might play around with some different articulations of the subject.